If a, d and l be first term, common difference and last term of an ap, find the number of terms in ap
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Step-by-step explanation:
t1 = a
d = d
l = tn
tn = a + ( n - 1 ) d
l = a + ( n - 1 ) d
l - a = nd - d
l - a + d = nd
l-a+d = n
d
n = l- a
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