Question
How many digits are required to write first 500 natural
numbers?Solution
Single digit numbers are from 1 to 9 so in that total digits used = 9. From 10 to 99 there are 90 numbers of 2 digits , so here digit used = 90 
2 = 180. From 100 to 500 there are 401 numbers of 3 digits = 3 401 = 1203 (as all are of 3 digit number). So number of digits required to first 500 natural number = 9+180+1203 = 1392
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41, 51, 63, 80, 101, 126
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137, 148, 190, 261, 361, 490- Find the wrong number in the given number series.
91, 103, 125, 163, 211, 271 Find the wrong number in the given number series.
15, 38, 67, 98, 135, 181
850, 849, 841, 814, 750, 688
Direction: Find the wrong number in given number series.
1977, 1945, 1837, 1575, 1081, 217.
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3, 6, 10, 15, 21, 29 Find the wrong term in the following series:
2, 4, 8, 14, 24, 32, 44
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- 342, - 218, - 96, 27, 150, 273
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26, 38, 60, 110, 206, 398
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