Question

ap is 3y-1,3y+1,5y+1, .........find y??
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Answer 1

common difference of an A.P. remains constant

d=3y+1-(3y-1)

d=2

Now also d=2=5y+1-(3y+1)

2=2y

y=1.....Ans.

Answer 2

3y+1 - (3y-1)=5y+1 -(3y+1)

3y+1-3y+1=5y+1-3y-1

2=2y

y=1

Hope it helps you...

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