Find the sum of 20 terms of 3+5+7+.....
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Here, a=3;d=2;n=20.
So,
sum of 20terms =n/2{2a+(n-1)d}
=20/2{6+(19)2}
=10(6+38)
=10(44)
Hence the answer is
=440
So,
sum of 20terms =n/2{2a+(n-1)d}
=20/2{6+(19)2}
=10(6+38)
=10(44)
Hence the answer is
=440
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