61. The sum of the first 100 numbers, 1 to 100 is always divisible by 


62. Find the least value of 'a' so that 365a24 is divisible by 8. 


63. Find the number of digits that are to be used in numbering a book of 400 pages. 


64. Find the number of divisor of 175. 


65. The number of divisors excluding 1 and itself for the number 1540 is 


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