Find The Sum Of The First 15terms Of The Sequence Of 2,4,6,8..

Find the sum of the first 15terms of the sequence of 2,4,6,8..

 

Answer:

S10=200

Step-by-step explanation:

Explanation:

There are two formulae to find the sum of the terms of an AP.

In this case we know the following:

a=2 d=4 n=10 Sn=n22a+(n−1)d

S10=1022(2)+(9)4

S10=54+36

S10=200

The other formula requires the last term, which is this case we do not know, but if necessary, we could work out.

S10=n2(a+l)


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