The first and the last term of an AP are 1 and 11 . If the sum of its terms is 36 , then the number of terms will be *
1 point
a. 5
b. 6
c. 7
d. 8
Answers
Answered by
3
Answer:
a= 1
L = 11
Sn = 36
=> n( a +L) /2 = 36
=> n(1+11)= 72
=> n *12 = 72
=> n = 6
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Answered by
1
a=1, l=11 ( given)
sn= n/2(a+l)
36=n/2(1+11)
36=n/2(12)
6n=36
n=6
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