Q : 10 Show that form an AP where an is defined as below :
Also find the sum of the first terms in each case.
It is given that
We will check values of for different values of n
and so on.
From the above, we can clearly see that this is an AP with the first term(a) equals to 4 and common difference (d) equals to -5
Now, we know that
Therefore, the sum of 15 terms is -465
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