The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:
3/5
3/10
4/5
4/3
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1
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The smallest value of n, for which 2n+1 is not a prime number, is
Solution 
2
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72519 X 9999
Solution 
3
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What is the unit digit { (6374)^1793 X (625)^317 X (341)^491 }
Solution 
4
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The Unit digit in the product (784 X 618 X 917 X463)
Solution4 X 8 X 7 X 3 
5
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The sum of first 45 natural numbers is:
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6
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If x is a whole number, then x²(x²  1) is always divisible by
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7
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(12)^{3} x 6^{4} ÷ 432 = ?
Solution 
8
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(1000)^9 / 10^24 =
Solution 
9
Discuss

A 3digit number 4p3 is added to another 3digit number 984 to give the fourdigit number 13q7, which is divisible by 11. Then, (p + q) is :
Solution 
10
Discuss

476 ** 0 is divisible by both 3 and 11.The non zero digits in the hundred's and ten's places are respectively:
Solution 
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