Three of the following four numbers are alike in a certain way. Choose the one that does not belong to the group.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 1948
Check whether each number is a perfect square.
Option (1) 2704 — \( 52 \times 52 = 2704 \): a perfect square.
Option (2) 1948 — \( 44 \times 44 = 1936 \) and \( 45 \times 45 = 2025 \); 1948 lies between them, so it is not a perfect square.
Option (3) 2116 — \( 46 \times 46 = 2116 \): a perfect square.
Option (4) 1936 — \( 44 \times 44 = 1936 \): a perfect square.
2704, 2116 and 1936 are perfect squares; 1948 is not, so 1948 is the odd one out.