(7) विषयों में से (4) विषय चुनने हैं लेकिन गणित और रसायन दोनों साथ में नहीं चुने जा सकते। कितने तरीके हैं?

From (7) subjects (4) subjects are to be selected but mathematics and chemistry cannot both be selected together. How many ways are there?

Explanation opens after your attempt
Correct Answer

C. (25)

Step 1

Concept

Total ways are \(\binom{7}{4}=35\) and if both special subjects are included there are \(\binom{5}{2}=10\) ways. Hence (35-10=25).

Step 2

Why this answer is correct

The correct answer is C. (25). Total ways are \(\binom{7}{4}=35\) and if both special subjects are included there are \(\binom{5}{2}=10\) ways. Hence (35-10=25).

Step 3

Exam Tip

कुल \(\binom{7}{4}=35\) हैं और दोनों विशेष विषय साथ हों तो \(\binom{5}{2}=10\) हैं। इसलिए (35-10=25) है।

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Mathematics Answer, Explanation and Revision Hints

(7) विषयों में से (4) विषय चुनने हैं लेकिन गणित और रसायन दोनों साथ में नहीं चुने जा सकते। कितने तरीके हैं? / From (7) subjects (4) subjects are to be selected but mathematics and chemistry cannot both be selected together. How many ways are there?

Correct Answer: C. (25). Explanation: कुल \(\binom{7}{4}=35\) हैं और दोनों विशेष विषय साथ हों तो \(\binom{5}{2}=10\) हैं। इसलिए (35-10=25) है। / Total ways are \(\binom{7}{4}=35\) and if both special subjects are included there are \(\binom{5}{2}=10\) ways. Hence (35-10=25).

Which concept should I revise for this Mathematics MCQ?

Total ways are \(\binom{7}{4}=35\) and if both special subjects are included there are \(\binom{5}{2}=10\) ways. Hence (35-10=25).

What exam hint can help solve this Mathematics question?

कुल \(\binom{7}{4}=35\) हैं और दोनों विशेष विषय साथ हों तो \(\binom{5}{2}=10\) हैं। इसलिए (35-10=25) है।