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1Â year, 5Â months ago
1Â year, 5Â months ago
yes but after difference of 49 we have to take difference of 81 so ... 9^2 +91 =81+91= 172
1Â year, 5Â months ago
11^2 + 91= 121+91=212
Difference is the sq. of odd no.s.
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