Question

Solve the sum
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Answer 1

Step-by-step explanation:

Just square it.

not whole only unit digit

$( {539}^{2} ) \\ just \: square \: unit \: digit \: \\ 9 ^{2} = 81 \\ \\ here \: unit \: digit \: is \: 1\: \\ \\ hence \: \: unit \: digit \: of \: \: ( {539}^{2} ) \: \: be \: 1$