a=210 d=10 an=40 n=? How many terms are in ap?
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Answer:16
because number of terms cannot be negative so,n=16
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Step-by-step explanation:
let an be tn.
a+d(n-1)=tN.
210+10n-10=40.
200+10n=40.
20+n=4.
16= -n.
so, n= -16.
not possible.
d could be negative
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