(1) से (12) तक के पूर्णांकों में से (4) संख्याएँ चुननी हैं। कोई दो संख्याएँ लगातार न हों और उनका योग सम हो। कुल कितने चयन होंगे?
(4) integers are to be selected from (1) to (12). No two selected integers should be consecutive, and their sum must be even. How many selections are possible?
Explanation opens after your attempt
Correct Answer
C. (66)
Concept
First consider non-consecutive selections of (4) numbers and then separate those with even sum. Parity classification helps in such questions.
Why this answer is correct
The correct answer is C. (66). First consider non-consecutive selections of (4) numbers and then separate those with even sum. Parity classification helps in such questions.
Exam Tip
पहले गैर-लगातार (4) संख्याओं के चयन पर विचार करें और फिर सम योग वाले चयन अलग करें। सम-विषम वर्गीकरण ऐसे प्रश्नों में सहायक है।
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