exam Maths Puzzle Numerical Ability

please help me solve this equation: logx base 2 + log2 base x=2

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exam Other Question

Mary and Lucy both leave from the same bus station. Mary drives 10mph slower than Lucy. In three hours, the are 260 miles apart. How do you set up an equation to solve?

~Confidently Confused~ if 'n'be a positive integer,prove that (1+1/n)^n+1 > (1+1/n+1)^n+2