Question

S3
for an Ap- 7, 10, 13, 16-
on?
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Answer 1

Answer:

u tu 9yun'I'm omg fdft up o NB wsz. f I know very l out e hi ok g GH

Answer 2

Step-by-step explanation:

ok

a=7, d=3, n=3 . ok

now,

sn= n/2 {2a+(n-1)d}.

3/2{2•7+(3-1)3}. =3/2(14+6).= 3/2•20=30 is the ans