(1) से (15) तक की संख्याओं में से (4) संख्याएँ चुननी हैं ताकि उनका गुणनफल विषम हो। कुल चयन कितने हैं?
From the numbers (1) to (15), (4) numbers are chosen so that their product is odd. How many selections are possible?
Explanation opens after your attempt
Correct Answer
C. (70)
Concept
The product is odd only when all four numbers are odd, so \( \binom{8}{4}=70 \). For product parity, check every factor.
Why this answer is correct
The correct answer is C. (70). The product is odd only when all four numbers are odd, so \( \binom{8}{4}=70 \). For product parity, check every factor.
Exam Tip
गुणनफल विषम तभी होगा जब चारों संख्याएँ विषम हों, इसलिए \( \binom{8}{4}=70 \)। गुणनफल की सम-विषम प्रकृति में सभी कारकों पर ध्यान दें।
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