Question

How many terms of AP: 9,17,25, ... must be taken to give a sum of 636?

Answer 1

Answer:

AP:9,17,25...

D=8

636=9+(n-1)×8

636-9=(n-1)×8

627=(n-1)×8

627÷8=(n-1)

78.3=(n-1)

78.3+1=n

79.3=n

Answer 2

Answer:

12

Step-by-step explanation:

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