exam Maths Puzzle Numerical Ability

4, 12, 6, 12, 36, 18, 36, is:

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exam Other Question

Hey,
Could you please help me with the following Binomial theorem expansion question?

The first three terms in the expansion of (1+ay)^n are 1, 12y, and 68y^2. Evaluate a and n On a musical instrument with four valves, how many different fingerings are possible?