Question

find the 20th term of the ap 9,13,17,21,----?

Answer 1

given,
a(first term)=9
d(common difference)=13-9=4
therefore,
tn=a+(n-1)d
now putting the value of a and d, we get the
20th term,
t20=9+(20-1)4
=9+19×4
=9+76
85(ans)

@skb

Answer 2

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Here's ur answer 》》》》》



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