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The number of five–digit telephone numbers which can be formed using the digits of 0, 1, 2,...., 9 is 105. The number of five-digit telephone numbers which have none of their digits repeated is 10P5 = 10 × 9 × 8 × 7 × 6 = 30240 Hence the required number =105 - 30240 = 69760
16 25 36 49 64 ?
5, 18, 39, 68, 105, ?
-1, 5, 23, 59, ?
58, 67, ?, 76, 40, 85
188 178 158 ? 88 38
Which of the following number will replace the question mark (?) and complete the given number series?
4, 5, 12, 39, 160, ?
418, 406, 430, 382, 478, ?, 670
12, 11, 20, 57, 224, 1015
216, 81, 297, 378, ?, 1035, 1728
8, 9, 125, ?, 1331, 169
