Question

For an A.P., the first and the last terms are 13 and 216 respectively. Common
difference is 7. How many terms are there in the A.P.? Find the sum of all the terms.​

Answer 1

Step-by-step explanation:

refer to the image attached above

Answer 2

Answer:

Step-by-step explanation:

apply

t1-tj/i-j=common difference

i-j=203/7

i-j=29

therefore no. of terms = 30

sn=n/2(t1+tn-1)

sn=15(229)=3435