(9) अलग-अलग अक्षरों में से (4) अक्षर चुनने हैं जिनमें (a) हो लेकिन (b) न हो। कितने तरीके हैं?
From (9) distinct letters (4) letters are to be selected containing (a) but not (b). How many ways are there?
Explanation opens after your attempt
Correct Answer
C. (35)
Concept
The letter (a) is fixed and (b) is excluded so choose the remaining (3) letters from (7). The ways are \(\binom{7}{3}=35\).
Why this answer is correct
The correct answer is C. (35). The letter (a) is fixed and (b) is excluded so choose the remaining (3) letters from (7). The ways are \(\binom{7}{3}=35\).
Exam Tip
(a) तय है और (b) हट गया है इसलिए बाकी (3) अक्षर (7) में से चुनेंगे। तरीके \(\binom{7}{3}=35\) हैं।
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