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What should come in place of the question mark (?) in the following question ?
$$(7921\div178)-5.5=\sqrt{?}$$
1512
1521
1251
1531
None of these
Let unknown be x,
$$(7921\div178)-5.5=\sqrt{x}$$
Hence, x=[(7921/178)-5.5]^2=39^2=1521
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