The smallest value of n, for which 2n+1 is not a prime number, is
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(?) - 19657 - 33994 = 9999
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How many prime numbers exist in 67 x 353 x 1110?
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3
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Find the sum to 200 terms of the series 1 + 4 + 6 + 5 + 11 + 6 + ....
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4
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The sum of first 45 natural numbers is:
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5
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A 3-digit number 4p3 is added to another 3-digit number 984 to give the four-digit number 13q7, which is divisible by 11. Then, (p + q) is :
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6
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What is the unit digit in {(6374)1793 x (625)317 x (341491)}?
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7
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The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:
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8
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The difference between the two numbers is 2395. When the larger number is divided by the smaller ones, the quotient is 6 and the remainder is 15. The smaller number is
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9
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Which of the following number is divisible by 24 ?
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10
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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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