Share

# Find the Sum of the First 22 Terms of the A.P.: 8, 3, -2, ……… - Mathematics

Course

#### Question

Find the sum of the first 22 terms of the A.P.: 8, 3, -2, ………

#### Solution

The given A.P is 8, 3, -2, .....

Here a = 8, d= 3 - 8 = -5 and n = 22

∴ S = n/2[2a + (n - 1)d]

= 22/2 [2 xx 8 + (22 - 1) xx (-5)]

= 11[16 + 21 xx (-5)]

= 11[16 - 105]

= 11 xx (-89)

= - 979

Is there an error in this question or solution?