Find the number of terms of the ap -12, -9, -6,......,21. If
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a = -12
d = -9+12 = 3
an = 21
an = a+(n-1) d
21 = -12+(n-1) 3
33/3 = n-1
n = 12
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Answered by
8
Answer:
a = -12
d = 3
an = 21
n = ?
an = a+(n-1) d
21 = -12 +(n-1) 3
33 = (n-1)3
11 = n-1
n = 12
no of terms in ap is 12
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