Question

which term of ap 5,9,13,17......is 81

Answer 1

Step-by-step explanation:

a=5 d=9-5=4 tn=81

formula

tn=a+(n-1)d

81=5+(n-1)4

81=5+4n-4

81=1+4n

81-1=4n

80=4n

n=80/4

n=20

therefore 81 is the 20th term of this ap

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Answer 2

20th term of this ap is 81

Step-by-step explanation:

Here,

a=5 d=9-5=4 tn=81

so, tn= a+(n-1)d

81=5+(n-1)4

81=5+4n-4

81=1+4n

4n=81-1

n=80/4

n=20

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