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We know the formula to find the fourth proportion - => a : b = c : d => 18 : 22 :: 27 : d => d = (27 × 22)/18 => d = 33
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 ...
