Math, asked by annugupta73, 1 year ago

find : the 20th term of the AP 9, 13, 17 ,21, ... ​

Answers

Answered by smartyrathore
7

a=20

d=13-9

=4

an= a+(n-1)d

=20+(20-1)4

=96

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Answered by Anonymous
14

welcome to the concept of Arithmetic progression.

given series :

9,13,17,21.

in this series :

a = 9 , d = 4

we know that

an = a+(n-1)d

then 20th term

= 9+(20-1)4

= 9+19×4

= 9+76

= 85

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