exam Maths Puzzle Numerical Ability

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?

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exam Other Question

sin(x)cos(x)divided by Cos squared (x)-Sin squared (x) =Tan(x) divided by 1-Tan Squared (x)
Prove that the left is equal to the right show step by step left changed to right side subtract: 13x/18-2x/9