Question
Select the letter-cluster from among the given option
that can replace the question mark (?) in the following series. PRESIDENT, RESIDENT, RESIDEN, ESIDEN, ESIDE, ?Solution
One letter from the beginning and one from the end of a term are removed, one by one, in alternate steps.
32, 48, 72, 108, 162, ?
14.8% of 7200 – 16.4% of 6200 + 15.09% of 8100 = 10% of ?
4, 4, 12, 60, ?, 3780
 6, 20, 63, 193, ?, 1758 Â
Find the missing number in the given number series.
4, ?, 110, 665, 4660, 37285
2.5Â Â Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.875Â Â Â Â Â 3.75Â Â Â Â Â Â Â ?
...7 47 ? 223 359 527
...124, 128, ?, 135, 110, 146
80, ?, 240, 80, 20, 4Â
23Â Â Â Â 40Â Â Â Â Â Â 67 Â Â Â Â Â Â 104Â Â Â Â Â Â ? Â Â Â Â Â Â 208
...