What value should come in the place of question mark (?) in the following questions?
$$(16)^{2}+(21)^{2}-(13)^{2}+?=(25)^{2}$$
First we calculate $$ 21^2 - 13^2 $$ through (a-b)(a+b) hence, it will be $$34 \times 8 = 272$$
Now answer will be = 625 - (272+256)
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