Question

find the sum of first 15 positive integers divisible by 4​

Answer 1

Answer:

4 8 12 16 20 24 28 32 36 40 44 48 52 56 60

Answer 2

step 1 Address the formula, input parameters & values.

Input parameters & values:

The number series 4, 8, 12, 16, 20, 24, 28, 32, .  .  .  .  , 60.

The first term a = 4

The common difference d = 4

Total number of terms n = 15

step 2 apply the input parameter values in the AP formula

Sum = n/2 x (a + Tn)

= 15/2 x (4 + 60)

= (15 x 64)/ 2

= 960/2

4 + 8 + 12 + 16 + 20 + 24 + 28 + 32 + .  .  .  .   + 60 = 480

Therefore, 480 is the sum of first 15 positive integers which are divisible by 4.