1.

Prove that the square of an odd number is also odd.

Answer»

FIRSTLY take some ODD NUMBERS 1,3,5,7,11

As we all KNOW formula of odd numbers is 2n-1

( n is the odd numbers)

2n-1= 2×1-1=1

2n-1=2×3-1=5

2n-1=2×5-1=9

2n-1=2×7-1=13

2n-1=2×11-1=21


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