(1) से (12) तक की संख्याओं में से (3) संख्याएं चुननी हैं जिनका योग विषम हो। कितने चयन संभव हैं?
Choose (3) numbers from (1) to (12) such that their sum is odd. How many selections are possible?
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Correct Answer
B. (110)
Concept
There are (6) odd and (6) even numbers. For odd sum choose (1) or (3) odd numbers, giving \(^{6}C_{1}{}^{6}C_{2}+^{6}C_{3}=110\).
Why this answer is correct
The correct answer is B. (110). There are (6) odd and (6) even numbers. For odd sum choose (1) or (3) odd numbers, giving \(^{6}C_{1}{}^{6}C_{2}+^{6}C_{3}=110\).
Exam Tip
(6) विषम और (6) सम संख्याएं हैं। विषम योग के लिए (1) या (3) विषम चुनें, संख्या \(^{6}C_{1}{}^{6}C_{2}+^{6}C_{3}=110\)।
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