exam Maths Puzzle Numerical Ability

Find the combinations. 10C2

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exam Other Question

The sum of two numbers is 25 and the sum of their squares is 313. Find the numbers. (Express one number as x, the other in terms of x).

Thanks. 1. (3x^2-5x+2)(3x^2-5x-2)=21
2. (x/x+2)^2 -7(x/x+2)+12=0; x is not= -2
3. solve: a/ax-1 + b/bx-4 =a+b
4. 1/p+1/q+1/x = 1/x+p+q