show that the nth odd natural number is 2n-1.
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1,3,5,7,..........n
d = 2
a = 1
t = 1 + (n-1)2
= 1+ 2n -2
= 2n - 1
hence proved
d = 2
a = 1
t = 1 + (n-1)2
= 1+ 2n -2
= 2n - 1
hence proved
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