Step-by-step explanation:

a+c/2=b or

find d

answer is in your hand

Answer: The value of y is 5

Step-by-step explanation:

Given that,

The first three term of an A.P are  3y-1 , 3y+5 and 5y+1

2(3y+5)=3y−1+5y+1

6y+10=8y

2y=10

y=10/2

y=5

Hence, the value of y is 5