If the number 653ab is divisible by 90, then (a + b) = ?
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A sixdigit number is formed by repeating a threedigit number; for example, 256256 or 678678 etc. Any number of this form is always exactly divisible by :
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On dividing a number by 56, we get 29 as remainder. On dividing the same number by 8, what will be the remainder ?
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The sum of first five prime numbers is:
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The difference between the local value and the face value of 7 in the numeral 32675149 is
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The smallest value of n, for which 2n+1 is not a prime number, is
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The sum of first 49 natural numbers is ?
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A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 98 are wrong and the other digits are correct , then the correct answer would be :
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Find the sum to 200 terms of the series 1 + 4 + 6 + 5 + 11 + 6 + ....
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The digit in unit’s place of the product 71 × 72 × ..... × 79 is
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What will be remainder when (67^{67} + 67) is divided by 68 ?
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