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We are writing all the multiples of 3 from 111 to 324. How many times will we write digit 3?

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Important Questions on Numbers and Their Properties

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What is the remainder when 7+77+777+7777+..... (till 100 terms) is divided by 8?
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A number has exactly 15 composite factors. What can be the maximum number of prime factors of this number?
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N=204×221×238×255××850. How many consecutive zeroes will be there at the end of this number N?
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1st 126 natural numbers are put side by side in the ascending order to create a large number N=123456125126 . What will be the remainder when N is divided by 5625
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When a number S is divided by 3,4, and 7 successively, remainders obtained are 2,1, and 4 respectively. What will be the remainder when the same number is divided by 84?
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What is the remainder when 1714×1715×1717 is divided by 12?
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If a, b, c and d are distinct integers in the range 10-15 (both inclusive), find the greatest value of (a+b) (c+d).