Question

15. The value of y if the first three ter
SP
espectively are 3y-1, 3y + 5 and 5y+1 is​

Answer 1

Step-by-step explanation:

a=3y-1

d=3y+5-3y+5=10

n=3

an=a+(n-1)d

5y+1=3y-1+2×10

5y-3y=20-1-1

2y=18

y=18/2

y=9