Which term of the ap 84,80,76,72 will be the first negative term?
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Answer:
a=84
d= -4
0=a+[n-1]d
0=84+[n-1]-4
0=84-4n+4 [divide eq by 4]
we get 4n=88
so n=88/4=22
so first negative term be 22+1 =23
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