what is 90 square in column method
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Number is 90 ,a= 9 and b= 0
In column l =
a² = 9² = 81
In column ll =
2×a×b = 2×9×0 = 18×0= 0
In column lll =
b² = 0² = 0
so, (90)² in column method is 8100
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