Question

th sum of n terms of the serious 2,5,8,11,______ is 60100 then n is
100
200
250
150​

Answer 1

Answer:

n = 200 so option:- (b)

Step-by-step explanation:

Given series 2,5, 8,11 + ....

Here a = 2, d = 3. Let number of terms be n.

Then sum of AP = n/2{2a + (n - 1)d}

60100=n/2(2 x 2+(n-1)3)

=> 120200 = n(3n+1)

⇒ 3n2 + n - 120200 = 0

⇒ (n - 200)(3n + 601) = 0

Hence, n = 200.

PLS MRK AS BRAINLIEST PLSSSSSSS.............. :)