Question

Arithmetic progression find the sum of 2+ 5 + 8 + – _– _ up to 31 terms​

Answer 1

Answer:

1457

Step-by-step explanation:

a = 1st term = 2

d = commpm difference = 5 - 2 = 8 -5 = 3

Sn for AP = n[2a + (n - 1)×d]/2

S(31) = 31[2×2 + ( 31 - 1)×3] /2 = 31 × (94) /2 = 31 × 47

S(31) = 1457

Answer 2

Answer:

1457 is the right answer