If in an a.p, a=15,d=-3 and an=0, then find the value of n.

1.	If in an a.p, a=15,d=-3 and an=0, then find the value of n.
Answer» a = 15 d = -3 an = 0an = a+ (n - 1)d15+(n -1)(-3) = 015 - 3n + 3 = 0- 3n + 18 = 0-3n = -18n = 18/3 = 6\xa0

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