Solution to “The product of two odd numbers is odd.” Using Direct proof method - Sikademy
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“The product of two odd numbers is odd.” Using Direct proof method

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If n and m are odd then n.m is odd,

n,m are real numbers

n=2a+1,

m=2b+1,

n.m=(2a+1).(2b+1),

n.m=4ab+2a+2b+1,

n.m=2(2ab+a+b)+1.


Odd integer=2k+1.

Multiply terms


Factor out of 2


n.m=2k+1, where

k=2ab+a+b=integer,

n.m are odd.

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