Question

If a^m.a^n= a^mn, then m(n- 2) + n (m - 2) is
(A) O
(C) -1
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Answer 1

a^m.a^n=a^mn

a^(m+n)=a^mn

m+n=mn

m(n-2)+n(m-2)

=mn-2m+mn-2n

=2mn-2(m+n)

=2mn-2mn

=0

Answer 2

Here is your answer, hope it helps.