Discussion
The least number which must be added to 3931 to make it a perfect square, is
Answer: A
The least number to add is 38.
\(62^{2} = 3844\) and \(63^{2} = 3969\), so 3931 lies between them, and the next perfect square is 3969.
\[ 3969 - 3931 = 38 \]
Adding 63, 69 or 169 gives 3994, 4000 and 4100, none of which is a perfect square (\(64^{2} = 4096\)).
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