(1) से (8) तक की संख्याओं में से (3) संख्याएँ ऐसी चुननी हैं जिनका योग सम हो। कुल चयन कितने हैं?
From the numbers (1) to (8), (3) numbers are chosen so that their sum is even. How many selections are possible?
Explanation opens after your attempt
B. (28)
Concept
The sum is even when (3) even numbers or (2) odd and (1) even number are chosen, giving (28). Count parity cases separately.
Why this answer is correct
The correct answer is B. (28). The sum is even when (3) even numbers or (2) odd and (1) even number are chosen, giving (28). Count parity cases separately.
Exam Tip
योग सम तब होगा जब (3) सम या (2) विषम और (1) सम चुने जाएँ, कुल (28) हैं। सम-विषम मामलों को अलग-अलग गिनें।
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