Question

1.How many terms are there in the AP 20, 25,
, 30, ...., 130?
(a)21
(b)22
le 23
(d) 24

Answer 1

Answer:

Given,

a=20

d=5

a(n)=130

We know,

a(n)=a+(n-1)d

=130=20+(n-1)×5

=130=20+5n-5

=(130-15)/5=n

=n=23

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