Choose or find odd number pair/group
$(5 : 50), (8 : 128), (11 : 242), (15 : 370)$

5 : 50

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8 : 128

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11 : 242

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15 : 370

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Solution

The correct option is A $5 : 50$
In all other pairs, second number is multiple of first number
$5 : 50 = 5 * 10$
$8 : 128 - 8 * 41$
$11 : 242 - 11 * 22$
$15 : 370 - 15 * 24.6$

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