exam Maths Puzzle Numerical Ability

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I need to solve this problem and show the equation used for the solution:

A coffee merchant has coffee beans that sell for #9 per pou

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exam Other Question

How do you know when an equation has an infinitely number of solutions or when an equation has no solution? Find the closed form of the following recursive function: a(n)=5*a(n-1) where a(0) is the initial value.