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Practice Set of numbers Questions and Answers

If digits of each number are added and sum is multiplied by 2, and the resultants are arranged in descending order, which number will be at last position?
If first and last digit of each number is multiplied and then the product is added to middle two digits of the number, which resultant number gets repeated...
If digits of each number are arranged is ascending order from, how many number/ numbers thus formed would be perfect square/ squares?
If third digit of each number is replaced by 7, then how many numbers will be divided by 7?
3 : 9 : : 8 : ?
Four number-sets have been given, out of which three are alike in some manner and one is different. Select the number-set that is different.

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