Others Maths Puzzle

9.99% failed in simple question...
give right answer of this question....
dekhte hai fb pr kitne genious hai.....
if ..
xy=x^2+y^2+xy+1
than
(12)*3=?

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Others Other Question

LEAST NO OF YEARS IN WHICH A SUM OF MONEY PUT AT 20% CI WILL BE MORE THAN 16 times of it. please tell us the shortest trick if on 1 january it was sunday then wht day will be on 31dec. 2014