In each of the questions given below, a sentence is given, divided into parts. One of the parts may contain an error. You are required to identify the part that contains an error.
Replace radical - (a noun) with radicalising- (a verb) .
18, 25, 33, 42, 52, 63, ?
3Â Â Â Â Â Â Â Â Â Â Â Â Â Â 25Â Â Â Â Â Â Â Â Â Â Â 173Â Â Â Â Â Â Â Â Â 1041Â Â Â Â Â Â Â 5201Â Â Â Â Â Â Â 20809
10       a Â...
800 400 600 1500 ? 23625
...16, 8, 8, ?, 24, 60
21, 63, 315, ?, 19845, 218295
5 29 ? 569 1703 3401
...13     26      78      ?     468     936
...If 10 9 38 x 5428
Then, 2x² + 1 = ?
...640 320 160 ? 40 20
12Â Â Â Â Â Â Â Â Â Â 8Â Â Â Â Â Â Â Â Â Â Â Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â 12Â Â Â Â Â Â Â Â Â Â 4.5Â Â Â Â Â Â Â Â Â 15
18Â Â Â Â Â Â Â...
