How many terms of the A.P.21, 18, 15,
12 ... will give the sum zero ?
(a) 16
(b) 13
(C) 15 solution
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The given AP is 21, 18, 15,………. Here, a = 21 and d = 18 - 21 = -3 Let the required number of terms be n. Then Hence, the required number of terms is 15..
(C).15 right
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Answer:
A= 21
d= -3
A.P = a+(n-1)d
A.P= 21+(11)-3
A.P = 21-33
A.P = -12 ans...
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