Find tha number of terms of tha ap are -12, -9,-6,....21 if 1 is added to each term of tha ap
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If we add any number in each term of the A.P. then number of term will not change.
Here, a=-12 ,d=3 , last term=21
we know that nth term of an
A.P. is given by Tn=a+d(n-1)
implies 21=-12+(n-1)×3
33= (n-1)×3
( n-1)=11
n=12.
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