Question

How many odd numbers from 1 in the order make the sum 400?​

Answer 1

Answer:

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Step-by-step explanation:

step 1

Address the formula, input parameters & values.

Input parameters & values:

The number series 1, 3, 5, 7, 9, . . . . , 799.

The first term a = 1

The common difference d = 2

Total number of terms n = 400

step 2

apply the input parameter values in the AP formula

Sum = n/2 x (a + Tn)

= 400/2 x (1 + 799)

= (400 x 800)/ 2

= 320000/2

1 + 3 + 5 + 7 + 9 + . . . . + 799 = 160000

Therefore, 160000 is the sum of first 400 odd numbers.