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1. If m and n are positive integers, which of the following must be an even integer?
- A. n(m - 1)
- B. n(m - 1)
- C. n(m - 1)
- D. n(m - 1)
Answer: Option D
Explanation:
Let's say m= 3 and n= 4 then n(n-1)(m-1)= 24
If m=3 and n=5 then n(n-1)(m-1)=40
So option 4 Will be even integer in every case.
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