Math, asked by diyu2741, 5 months ago

For an A.p a=1,d=4what is the value of n,if tn=81

Answers

Answered by lokeshchandani98

1

21

Step-by-step explanation:

Tn = 81

a+(n-1)d = 81

1+(n-1)4 = 81

(n-1)4 = 80

n-1 = 20

n= 21

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