How many terms of the ap 18, 16, 14, s dot dot dot dot be taken so that their sum is zero?
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Answer:
Step-by-step explanation:
a=18 d=16-18=-2
An=a+(n-1)d
An=18+(n-1)-2
An=20-2n
Sn= n/2(a+An)
Since Sn =0
0=n/2(18+20-2n)
0=n(38-2n)
2n=38
n=19
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