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Solution

✅ Correct Option: 4

In each pair the second number should be n(n−2)n(n-2).

23×21=48323 \times 21 = 483, 21×19=39921 \times 19 = 399, 27×25=67527 \times 25 = 675.

For 15 this would give 15×13=19515 \times 13 = 195, but the pair shows 165, which equals 15×1115 \times 11. So 15 - 165 is the odd one.

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