The smallest value of n, for which 2n+1 is not a prime number, is
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#  Quiz 

1
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Which of the following is a prime number ?
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2
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If p and q are the two digits of the number 653pq such that this number is divisible by 80, then p+q is equal to :
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3
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The sum of first 45 natural numbers is:
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4
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(112 X 5^4)
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5
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What least number must be subtracted from 427398 so that the remaining number is divisible by 15?
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6
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The difference of two numbers is 1365. On dividing the larger number by the smaller, we get 6 as quotient and the 15 as remainder. What is the smaller number ?
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7
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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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8
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The sum of first 49 natural numbers is ?
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9
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The difference between the squares of two consecutive odd integers is always divisible by:
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10
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107 x 107 + 93 x 93 = ?
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