Question

find the sums of first 40 positive integers divisible by 7​

Answer 1

Answer:

step 1 Address the formula, input parameters & values.

Input parameters & values:

The number series 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, . . . . , 280.

The first term a = 7

The common difference d = 7

Total number of terms n = 40

step 2 apply the input parameter values in the AP formula

Sum = n/2 x (a + Tn)

= 40/2 x (7 + 280)

= (40 x 287)/ 2

= 11480/2

7 + 14 + 21 + 28 + 35 + 42 + 49 + 56 + 63 + 70 + 77 + . . . . + 280 = 5740

Therefore, 5740 is the sum of first 40 positive integers which are divisible by 7.

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