'O' is the circumcentre of triangle ABC. If

254, ?, 1022, 1150, 1214, 1246

80, 120, 30, 45, 9, 13.5, ?

252, 128, 66, 35, 19.5, ?

1029, 1030, 1039, 1064, ?, 1194

What will come in place of the question mark (?) in the following series?


28, 45, 75, 118, 174, ?

1        1        4         ?        280         3640

230 192 172 ? 122 100

What value should come in the place of (?) in the following number series?

5670, 1620, 540, 216, 108, ?

What will come in place of the question mark (?) in the following number series?

124, 131, 117, ?, 110, 145