if n is a positive integer ,then 3n(3n-1)will be even number for
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to prove this let us take n=1,2,3,........in 3n(n-1)
let put n=1 for first positive number :
3×1(3×1-1)=3(2)=6
as u will solve this again and again by diff. positive no. u will get always an even answer.
hence it is proved.....
let put n=1 for first positive number :
3×1(3×1-1)=3(2)=6
as u will solve this again and again by diff. positive no. u will get always an even answer.
hence it is proved.....
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