Question

If an=3n-5 then S3 is..?
a)3 b)4 c)5 d)7

please help...​

Answer 1

Answer:

3

Step-by-step explanation:

cbshsjshsbsnssksgsv s s

Answer 2

Answer:

-2, 1,4

s3=3/2{2(-2) +(3-1) 3}

=3/2{-4+6}

=3/2×2

s3=3