Math, asked by nnagababu726pb8ss4, 11 months ago

please answer this question very fast

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Answered by akshith90

1

an=a+(n-1)d
an=0
a=18
n=?
d=-3
0=18+(n-1)-3
0=18-3n+3
0=21-3n
-21=-3n
21=3n
n=21÷3
n=7

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