exam Maths Puzzle Numerical Ability

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exam Other Question

How would you solve the problem i^7+i^2+i^12+i^9 over (1-i)^2? SUPPOSE X IS A POSITIVE AND Y IS A NEGATIVE. WHICH EQUATION WOULD RENDER THE HIGHEST NUMBER?

A. X+Y
B. X-Y
C. Y-X
D. /Y/-X