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Option 3 : 7 : 72
Logic: Second Number = (First number + 1) × (First Number + 2)
The Pattern followed here is:
In 13 : 210
(13 + 1) × (13 + 2) = 210 (Second Number)
Similarly,
(7 + 1) × (7 + 2) = 72 (Second Number)
Hence, The correct answer is "7 : 72 ".
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