the first and last terms of an Ap are 1and 11 if the sum of all its terms is 36 then find the number of terms in the AP
Answers
Answered by
4
Answer:
N=6
Step-by-step explanation:
First term,A= 1
Last term,L = 11
sum of all terms =36 = (N÷2)×(A+L)
N=6
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Answered by
5
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A = 1
An = 11
Sn = 36
Sn = n/2 [A + An]
36 = n/2 [1 + 11]
36 = n×6
n = 6
A = 1
An = 11
Sn = 36
Sn = n/2 [A + An]
36 = n/2 [1 + 11]
36 = n×6
n = 6
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