Question

If the nth term of an AP -1,4,9,14...... Is 129 find the AP

Answer 1

Answer:a= -1

d=5

n=129

An=?

Step-by-step explanation: An= a + (n-1)d

An= -1+(129-1)5

An= -1+(128)5

An= -1+(640)

An= 640-1

An= 639

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