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Answered

What is the sum of the first 15 terms of
this sequence { 5, 9, 13,…} ?

Sagot :

Lijahnicsarcanogo

Answer:

Correct option is

C

4n - 3

Given series is 1,5,9,13,17,...

Common difference (d)=5−1=4

First term is a=1

So n  

th

 term is t  

n

​

=a+(n−1)d=1+(n−1)4=4n−3  

∴t  

n

​

=4n−3

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