book Maths Puzzle Numerical Ability

please help me solve the following square root of 2/3 * squareroot 8/12

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book Other Question

Prove that the square of an odd integer is always of the form 8k+1, where k is an integer.

Last one: Prove that n^2-5n^3 + 4n is divisible by 120 for all positive integers n is will you please help me with this problem?
4x/x-4 - 3x/x-2= -3/x^2-6x+8
Instructions: solve the following equations. Be sure to check each answer in the orfiginal equation if you