Question

for an an AP the first and the last term are 13 and 216 respectively common difference is 7 how many terms are there in AP find the sum of all the term ​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

Number of terms= 30

Sum of all terms = 3435

Step-by-step explanation:

we know that

an = a + (n-1) d

where a=13 an=216 and d= 7

when we substitute we get final answer as

n=30

then, we know that

Sn= n/2 ( a+ an)   ; or we can use Sn= n/2 ( 2a + (n-1) d )

where n = 30 , a= 13 and an= 216

after substituting all these values in the formula we get

Sn = 3435