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# CBSE Class 10 Answered

the first and the last term of an AP are -4 and 146 and the sum of Ap 7171. find the number of terms in AP and common diference
Asked by mbrasali73 | 26 Jun, 2019, 07:05: PM
Expert Answer
a = -4, l = 146, Sn = 7171,
Sn = 7171
n/2 (a + l) = 7171
n/2 (-4 + 146) = 7171
n = 101
According to the question,
a101 = 146
a + 100d = 146
-4 + 100d = 146
100d = 500
d = 5
Answered by Sneha shidid | 27 Jun, 2019, 09:38: AM

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