Question
How many figures (digits) are required to number a book
containing 250 pages?Solution
 Alternate Method: Remember that digits used to write 1 to 100 = 192 digits & from 101 to 250, there are 150 numbers & all are of 3 digits hence 450 digits are used. Hence total digits required to write 1 to 250 = 192 + 450 = 642 digits
More No. System Questions
64, 80, 120, 210, ?, 945
Find the missing number, in the given number series.
60, 150, ?, 450, 450, 225
What will come in place of the question mark (?) in the following series?
48, 291, ?, 399, 408, 411
98, 134, 198, ?, 442, 638
216, 81, 297, 378, ?, 1035, 1728
Which of the following numbers will replace the question mark (?) in the given series?
17, 30, 44, 59, 75, ?
114, 134, 174, 254, 414, ?Â
10296/72 + 3040 = (? × 4) + 1395
5, 6, 14, 45, ?, 925
4.8, 14, 62, ?, 1516, 7578Â
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