exam Maths Puzzle Numerical Ability

3(5^x+1) = 15

Solve for x.

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exam Other Question

Find each of the following squares.
(7p + 6q)^2
you have the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0
You have to find the number of possible solutions for a four digit code.
numbers can be used more than once
I tried 10X4 and got 40 but i think its to low