Question: D Show that a,, a,, ... a,...form an AP where a is defined as below : = 3+ 4n (i) a, 39-5 Also find

D Show that a,, a,, ... a,...form an AP where a is

D Show that a,, a,, ... a,...form an AP where a is defined as below : = 3+ 4n (i) a, 39-5 Also find the sum of the first 15 terms in each case. I. If the sum of the first n terms of an AP is 4n - n, what is the first term (that is S,)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms. 2 Find the sum of the first 40 positive integers divisible by 6. lem 3S Find the sum of the first 15 multiples of 8.

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