Which term of ap 21 ,42,63 ,84.....is 420
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Answer:
a=21
d=42-21=21
an=420
an=a+(n-1)×d
=21+(n-1)×21=420
(n-1)×21=420-21=399
(n-1)=399÷21=19
n=19+1=20
so 20th term is a a.p
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