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I can not understand for snap three exams

ax+by=4,ax^2+by^2=2,ax^3+by^3=-3
(a,b,x,y all real no.) Then find (2x-1)(2y-1)???

Remainder when 18^2018 is divided by 100?

Which book is better for cat arun sharma or servesh verma?

How to check answer

i want to snap course not Cat

In \triangle ABC, \angle A = 66^{\circ}, BD \perp AC△ABC,∠A=66 ∘ ,BD⊥AC and CE \perp ABCE⊥AB. BD and EC inrersect at P. The bisectors \angle∠ PBC and \angle∠ PCB meet at Q. What is the measure of angle BQC

sir how to decide which college form to fill as per college form we have to pay some fees too ..{like per form if we take 1000 rs fees nd if we fill 10 forms than in fees fees its 10k spent }..so how to decide sir ?

expected iift sectional cutoffs for general?? is a 20+ score in both dilr and quant considered a safe zone?

i have 65 in 10th 69 in 12 and 60 in grade which iim can i get?