Question

if the first term of an ap is 2 and common difference is 4, then the sum of its 20 terms is​

Answer 1

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Answer 2

Answer:

Sum of 20 terms will be 800

Step-by-step explanation:

Given first term a = 2 , common difference d = 4

We know sum of n terms in A.P is : n/2(2a+(n-1)d)

for the given problem Sum of 20 terms will be : 20/2(2×2+(20-1)×4) = 10(4+76) = 800

Thus sum of the 20 terms is 800

Thank you