If m and n are integers divisible by 5, which of the following is not necessarily true ?
Options:
A . m + n is divisible by 10
B . m - n is divisible by 5
C . m2 - n2 is divisible by 25
D . None of these
Answer: Option A Take m = 15 and n = 20 Then, each one of m and n is divisible by 5 But (m + n) is not divisible by 10 Hence, (m + n) is divisible by 10 is not true.
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