In the given problem, we need to find the number of terms in an A.P
(i) 25, 50, 75, 100 …
We are given,
Let us take the total number of terms as n.
First term (a) = 25
Last term (an) = 1000
Common difference (d) =
Now, as we know,
So, for the last term,
Therefore, the total number of terms of the given A.P. is.
(ii) -1, -3, -5, -7 …
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