exam Maths Puzzle Numerical Ability

What symbols and/or abbreviations are used to show the set of real numbers and the different subsets of real numbers?

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exam Other Question

i have to show whether the following numbers are divisible by 2,3,or 5...The work needs to be shown. the numbers are 925, 165,351, and 1,495 My question is to solve the equation ------5 over 2 plus i