self Maths Puzzle

let y=((1+ai)/(b-i))^x,where a,b,x and y are integers.it is known that x is an even number greater than 100 but not divisible by 4,which of the following statements willl always be true??(i is complex such that i^2=(-1))

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self Other Question

[(55*55*55)-(42*42*42)=...??? A bank gives an investor double the initial deposit in 5years, interest being simple interest. Then the rate of Interest is: