Question

Find the sum of 1st 15 terms of an AP if the numbers r 2,4,6,8.....

Answer 1

Your Ans is in the attachment

Answer 2

Answer:

Sum of first 15 terms is 240

Step-by-step explanation:

1. Sum of n terms =n/2{2a+(n-1)d}
2. Sum of 1st fifteen terms=15/2{2a+(15-1)d}
3. a=2(first term),d=2(common difference
4. On solving 2.step
5. We get 15/2{2×2+14×2}=15/2×{32}
6. Sum=480/2
7. Answer is 240
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