If in a certain way, $$3 + 4 = 25$$ and $$7 + 24 = 625$$, then find $$9 + 40 = ?$$
The sum of the square of the numbers is done here.
$$3^2+4^2 = 9+16 =Â 25$$
$$7^2 + 24^2 = 49+576 = 625$$
$$9^2 + 40^2 = 81+1600 =Â 1681$$
Hence 1681 will come in place of question mark.
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