(6) विषयों में से (3) विषय चुनने हैं लेकिन गणित और भौतिकी दोनों साथ में नहीं चुने जा सकते। कितने तरीके हैं?
From (6) subjects (3) subjects are to be selected but mathematics and physics cannot both be selected together. How many ways are there?
Explanation opens after your attempt
Correct Answer
C. (16)
Concept
Total ways are \(\binom{6}{3}=20\) and if both special subjects are included the third subject is chosen in (4) ways. Hence (20-4=16).
Why this answer is correct
The correct answer is C. (16). Total ways are \(\binom{6}{3}=20\) and if both special subjects are included the third subject is chosen in (4) ways. Hence (20-4=16).
Exam Tip
कुल \(\binom{6}{3}=20\) हैं और दोनों विशेष विषय साथ हों तो तीसरा विषय (4) तरीकों से चुनेगा। इसलिए (20-4=16) है।
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