Find a & b such that numbers a , 9 , b, 25 form an AP

1.	Find a & b such that numbers a , 9 , b, 25 form an AP
Answer» A2=a+d,A4=a+3d9=a+d25=a+3d-16=-2d8=d,a=1b=a+2db=1+2(8)b=1+16b=17

Discussion