Question

Find the average of first 71 odd numbers
Plz fast​

Answer 1

Answer:

step 1 Address the formula, input parameters & values.

Input parameters & values:

The number series 1, 3, 5, 7, 9, . . . . , 141.

The first term a = 1

The common difference d = 2

Total number of terms n = 71

step 2 apply the input parameter values in the AP formula

Sum = n/2 x (a + Tn)

= 71/2 x (1 + 141)

= (71 x 142)/ 2

= 10082/2

1 + 3 + 5 + 7 + 9 + . . . . + 141 = 5041

Therefore, 5041 is the sum of first 71 odd numbers.