exam Maths Puzzle Numerical Ability

what is the simplified answer to (a^n-1*b^-2n)/ (a^n+1*b^2n-2). The directions say "assume that no denominator equals 0 and that m and n are integers greater than 1."

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exam Other Question

The amount of money A accrued at the end of N years when a certain amount P is invested at a compound annual rate r is given by A=P(1+r)^n IF a person invests $120 at 6% interest
What are the next five terms in this sequence?:
3,10,5,16,8,4,2,1,4.... ???