(13) अलग-अलग अक्षरों में से (6) अक्षर चुनने हैं जिनमें (a) हो, (b) न हो और (c,d) में से ठीक एक अक्षर हो। कितने तरीके हैं?
From (13) distinct letters (6) letters are to be selected containing (a), not containing (b), and containing exactly one of (c,d). How many ways are there?
Explanation opens after your attempt
Correct Answer
C. (252)
Concept
The letter (a) is fixed and (b) is excluded. Choose (1) from (c,d) and (4) from the remaining (9), so \(\binom{2}{1}\binom{9}{4}=252\).
Why this answer is correct
The correct answer is C. (252). The letter (a) is fixed and (b) is excluded. Choose (1) from (c,d) and (4) from the remaining (9), so \(\binom{2}{1}\binom{9}{4}=252\).
Exam Tip
(a) तय है और (b) हट गया है। (c,d) में से (1) और शेष (9) में से (4) चुनेंगे इसलिए \(\binom{2}{1}\binom{9}{4}=252\) है।
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