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Option 2 : 21
In the first column 102 = 100, 62 = 36, 10 + 6 = 16
In the second column 72 = 49, 52 = 25, 7 + 5 = 12
Similarly,
⇒ 112 = 121, 102 = 100, 11 + 10 = 21.
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