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How many ways are there to arrange 5 different beads on a straight string?

Answer and explanation

Correct answer: 120

The governing concept is permutation: when different objects are placed in a row, their order matters. For the first position there are 5 choices, for the second 4 remaining choices, then 3, 2, and 1. Therefore, the total number of arrangements is 5 × 4 × 3 × 2 × 1 = 5! = 120. Thus option C is correct. A value of 60 would not account for all possible orders, while 25 is only 5² and does not represent placing five distinct beads without replacement. The value 10 is also unrelated to this arrangement problem. Because the beads are on a straight string rather than in a circle, rotations are not identified as the same arrangement; hence no circular-arrangement division is required.

Related tags

PermutationsStraight ArrangementFactorialClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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