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Question 1. Asked on :24 August 2019:09:11:37 PM

#### Find the sum of the A.p.1+3+5+7+.....+199.

-Added by Prince Rawat Mathematics » Arithmetic Progressions

Akki chauhan
an = a+ (n-1)d
199 = 1 + (n-1)2
198 = (n-1)2
198/2 = n - 1
99 = n - 1
n = 100

No: of terms = n = 100
Sum is 100.
Sum = Sn

Sn = n/2 [a + an]
= 100/2 [ 1 + 199]
= 50 [ 200]
= 10000

-Answered by Akki chauhan On 27 August 2019:09:29:28 AM(6711Average Rating Based on rating)

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