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Question
If m and n are positive integers, which of the following must be an even integer ?
n(m-1)
(n-1)m
(m-1)(n-2)
n(n-1)(m-1)
None of these
ANSWER : 4
Descrption
<p>Let's say m= 3 and n= 4 then n(n-1)(m-1)= 24</p><p>If m=3 and n=5 then n(n-1)(m-1)=40 </p><p>So option 4 Will be even integer in every case. </p>
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