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Subjects

Mathematics

Permutations

In this Class 11 Mathematics topic from the chapter “Permutations and Combinations,” students learn how to count ordered arrangements of objects or selections. They work with the fundamental principle of counting, factorial notation, and permutation formulas such as nPr, while examining how arrangements change when some conditions or repetitions are involved. The topic also helps students distinguish permutations, where order matters, from combinations, where order does not, and apply these ideas to structured counting problems.

Expert · Level 4 · 25 questions

Practice questions

01In arrangements of the letters of (ALGEBRA), how many have the two (A)s not together?

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02(6) distinct boys and (6) distinct girls sit in a row alternately. How many arrangements are possible?

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03How many (4)-digit numbers can be formed from digits (2,3,4,5,6,7,8,9) without repetition and divisible by (25)?

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04What is the number of distinct arrangements of the letters of (SUCCESS)?

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05From (10) distinct flags, (4) flags are to be placed on a straight string. How many arrangements have one particular flag always at the leftmost position?

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06In arrangements of the letters of (EQUATION), how many have (E) and (O) never adjacent?

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07(5) distinct mathematics books and (4) distinct physics books are to be arranged on a shelf. How many orders have at least one mathematics book between any two physics books?

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08In (5)-letter arrangements formed from (9) distinct letters, how many have two particular letters adjacent?

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09How many (5)-digit numbers can be formed from digits (0,1,2,3,4,5,6,7,8) without repetition such that (0) is included but not as the first digit?

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10In arrangements of the letters of (TRIANGLE), how many have (T) and (E) at the two ends?

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11(10) distinct people are seated in a row. Two particular people sit together and a third particular person is not at either end. How many arrangements are possible?

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12In a circular seating of (8) distinct students, how many arrangements have two particular students sitting exactly opposite each other?

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13In arrangements of the letters of (CALCULUS), how many have the two (C)s separated?

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14How many (5)-digit numbers can be formed from digits (1,2,3,4,5,6,7,8) without repetition such that the digits are in increasing order?

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15What is the number of distinct arrangements of the letters of (PROBABILITY)?

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16(12) distinct prizes are to be distributed among (5) students such that one student receives (4) prizes and each of the remaining (4) students receives (2) prizes. How many distributions are possible?

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17(7) distinct people are to be seated in a circle. Two particular people must be adjacent and two other particular people must not be adjacent. How many arrangements are possible?

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18How many (6)-digit passwords can be formed from digits (0,1,2,3,4,5,6,7,8,9) without repetition such that the first digit is not zero and the last digit is even?

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19What is the number of distinct arrangements of the letters of (INDEPENDENT)?

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20(9) distinct players are to stand in a row. The captain must always be to the left of the goalkeeper, with any number of people between them. How many arrangements are possible?

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21(8) distinct cards are to be arranged in a row. How many arrangements have exactly (2) cards between two particular cards?

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22In arrangements of the letters of (SELECTION), how many have all vowels together?

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23(10) distinct objects are arranged in a row. Three particular objects must appear in the relative order (A) before (B) before (C), but they need not be adjacent. How many arrangements are possible?

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24How many arrangements of the letters of (ENGINEERING) can be formed such that no two vowels are adjacent?

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25(8) distinct students are to be seated around a circular table. If (A) and (B) must always sit together, how many arrangements are possible?

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