find : the 20th term of the AP 9, 13, 17 ,21, ...
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Answered by
7
a=20
d=13-9
=4
an= a+(n-1)d
=20+(20-1)4
=96
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Answered by
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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