Question

If 10th term of an apis 47 and the first term is 2,then find the sum of its 15 terms

Answer 1

first term a = 2

let common difference = d

Tn = a + (n-1)d

47 = 2 + (10-1)d

d = 5

Sn = n[2a + (n-1)d]/2

S15 = 15[2*2 + 14*5]/2

S15 = 15*37 = 555

pls mark as brainliest