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O lives in flat 2 on odd numbered floor S lives above O in the same type of flat and to the east of T. 3. T doesn’t live on floor 3. So, O lives on flat 2 of floor 3 or flat 2 of floor 1. Case W: O lives on flat 2 of floor 3: 
Case II: O lives on flat 2 of floor 2: Case II(a): 
Q and V live in the same type of flat such that Q lives immediately above V but below floor 3. Q lives in southeast of T. X lives to the west of Q. X and U live in the same type of flat and X lives immediately above U, this is not possible in case II(b), so case II(b) is rejected. . U doesn’t live in flat 1, so case II(a) is rejected. So, X lives in flat 2 of floor 2 and U lives in flat 2 of floor 1. Q and V lives in flat 3. 
52 60 44 68 ? 76
14 26 50 98 194 ?
...If 4 10 16 26 x 50
Then find the value of (x² - 1) + ( x² + 1).
...5 10 40 80 320 640
4 a b c d e
Find the value of d.
...800 544 416 352 ? 304
18, 25, 33, 42, 52, 63, ?
Select the number from among the given options that can replace the question mark (?) in the following series.
2, 6, 12, 20, ?, ?
10 19 58 ...
16, 8, 8, ?, 24, 60
4 7 24 91 462 2763
18 ...
