Question

Find the sun of ap 3+8+11+............25

Answer 1

Answer:

this is not in the form of ap

Answer 2

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We know the sum of n terms of an A.P with first term a and the common difference d is:

Sn=2n[2a+(n−1)d]

Here, it is given that the first term is a=3, common difference is d=7−3=4 and n=25, therefore, the sum is:

S25=225[(2×3)+(25−1)4]=225[6+(24×4)]=225(6+96)=225×102=25×51=1275

Hence, the sum is 1275.

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