Question

Now, find the value of
(i) 13+ 23 +33 + ... + 83

Answer 1

Answer:

384

Step by Step Explanation:

a = 13, d = 10, An = 83

An = a + (n - 1)d

83 = 13 + (n - 1)10

7 = n - 1

Therefore, n = 8

Sn = n/2[a + An]

= 8/2[13 + 83]

= 4(96) = 384

Hope it helps you.........