Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.
A.5 : 35
B.13 : 195
C.19 : 324✓ Correct
D.7 : 63
Explanation
In 5:35, 7:63, 13:195, the second number equals the first multiplied by (first+2): 5×7=35, 7×9=63, 13×15=195. For 19:324, 19×21=399 ≠ 324, so this pair is the odd one out.
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