the first and last term of an A. P. are 1 and 11 respectively. if the sum of its term is 36
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Answer:
a= 1
L = 11
Sn = 36
=> n( a +L) /2 = 36
=> n(1+11)= 72
=> n *12 = 72
=> n = 6
No.of terms = 6
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