4. The first and last term of an A.P. are – 4and 146. The sum of terın is 7171. Thenumber of terms is(A) 100(B) 101(C) 102(D) 99 About the author Anna
Answer: Given that, a1 = -4, aN = 146 And Sn = 7171 We want to find number of terms (. i. e., n) Sn = n/2 ( aN + a1) 7171 = n/2 ( 146 – 4) 7171 = n/2 × 142 7171 = n × 71 n = 7171 / 71 n = 101 I hope this will help u. Please add this to the brainlist and give some thanks. Reply
Answer:
Given that,
a1 = -4, aN = 146
And Sn = 7171
We want to find number of terms (. i. e., n)
Sn = n/2 ( aN + a1)
7171 = n/2 ( 146 – 4)
7171 = n/2 × 142
7171 = n × 71
n = 7171 / 71
n = 101
I hope this will help u. Please add this to the brainlist and give some thanks.