the20thtermofthe ap9,13,17,21,....
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here n=20 a=9 d=13-9=4
term of an ap= a+(n-1)d
so 20th term=9+(20-1)4
=9+72
=81
term of an ap= a+(n-1)d
so 20th term=9+(20-1)4
=9+72
=81
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