Math, asked by fiftyshadesandb5034, 11 months ago

Which term of AP is 21,42,63,84 is 420

Answers

Answered by rahulchoudhary98

10

Answer:

20

Step-by-step explanation:

a +(n-1)d = an

21 +(n-1)21=420

(n-1)21= 399

n-1=19

n= 19+1

n=20

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