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Question

Which term of the AP 24,21,18,.............. is the first negative term. ?

A
8th
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B
9th
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C
10th
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D
12th
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Solution

The correct option is C 10th
Since the series is divisible by 3,
The first -ve term = -3
ATP
a=24
d=2124=3
Tn=a+(n1)d
3=24+(n1)(3)
(n1)(3)=27
n1=9
n=10
(Ans: 10th term C)

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