Question

find the sum of following ap 1 ,3,5,7.......199​

Answer 1

First term = a₁ = 1

Second term = a₂ = 3

Common difference = d = a₂- a₁ = 3 - 1 = 2

Last term = an = 199

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 = Sn

Sn = n/2 [a + an]

= 100/2 [ 1 + 199]

= 50 [ 200]

= 10000

Sum = 10000

Twinkle❤️(◔‿◔)

Answer 2

Answer:

10000 is the sum of the following ap