Question

find out the sum of the following A.P
3+8+13+18+..................up to 20 terms.

Answer 1

Solution:-

Given= a=3,d=8-3=5,n=20

So,S=n/2{2a+(n-1)d}

S=20/2{2×3+(20-1)5}
S=10×101
S=1010 Answer.

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Answer 2

Answer :
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HERE, a = 3, d = 8 - 3 = 5, n =20

So, S20 = 20/2 {2*3+(20-1)5}
= 10 (6 +19*5)
= 10 (6 + 95)
= 10 *101
= 1010
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