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A number is divisible by 11, if the difference between the sum of its digit at even places and the sum of its digits at odd places is either 0 or a number divisible by 11. ( 9 + * + 7 + 4 ) – ( 4 + 6 + 1 ) = 0 or multiple of 11 ⇒ 20 + * - 11 = 11 ⇒ * + 9 = 11 * = 11 - 9 = 2 * = 2
306, 272, 240, ?, 182, 156
18, 34, 70, 134, ?, 378
32 33 29 38 ? 47 11
...3.6 × 1.5 + 8.4 × 2.5 – 9.2 × 3.5 = ? – 9.2 × 4.4
14, 20, 29, 44, 65, ?
143 119 107 101 98 ?
23, 27, 39, 59, ?, 123
216, 81, 297, 378, ?, 1035, 1728
