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Write an AdotPdot having 4 as the first ...

Write an `AdotPdot` having `4` as the first terms and `-3` as the comon difference.

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First term =`a=4`
Second term =`a+d=4−3=1`
Third term =`a+3d=4−6=−2`
Fourth term =`a+3d=4−9=−5`
So the A.P. is `4,1,−2,−5....`
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