Question

first term of an arithamatic sequence is 10 and common diffrence is 6
a.what is 11 th term
b.what is sum of first 21 terms
c.write an arithamatic sequence with sum of first 21 terms is 1491​

Answer 1

Answer:

a11=a+(n-1)d

=10+(11-1)6

=10+10×6

=10+60=70