SOLUTION: Find the number of terms in an A.P, whose first term is 1, last term is 77 and the sum of terms is 507
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Sequences-and-series
-> SOLUTION: Find the number of terms in an A.P, whose first term is 1, last term is 77 and the sum of terms is 507
Log On
Sn = sum of first n terms of arithmetic progression (AP)
Sn = (n/2)*(first term + nth term)
507 = (n/2)*(1 + 77)
507*2 = 78n
1014 = 78n
n = 1014/78
n = 13