exam
Maths Puzzle
Numerical Ability
subtract: 13x/18-2x/9
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exam Other Question
How may different 5-digit numbers that are odd and less than 50,000 can be formed using the digits 2,3,4,5,6,7 and 8 without repetition?
Simplify each expression. Use only positive exponents.
(2r^-1 s^2 t^0)^-2 /2rs
Note: I left a space in the parenthesses so that you would know that 2r^-1, s^2 and t^0 are in the parenthesses.