Question

Q. If the nth of an AP -1,4,9,14...........is 129 . Find the value of n.
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Answer 1

Answer:

here given data is

a=4,d=9-4=5,An=89,n=?

We know that

An=a+(n-1)d

89=4+(n-1)5

send 4 to left side

85=5n-5

5n=90

n=18

Hence it 89 is 18 th term of the AP

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Answer 2

Answer:

27 is the correct answer

Step-by-step explanation:

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