Which term of AP 81,78,75is its first negative term
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Answer:29th term
Step-by-step explanation:
a=81 , d=-3
nth term <0
a+(n-1)d<0
81+(n-1)(-3)<0
81-3n+3<0
84-3n<0
n>28
Hence n=29th term
29th term of given AP will be it's first negative term
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