exam Maths Puzzle Numerical Ability

A) -4 -3 -4Z = 1
-5 +1Y +2z =-34
5X -1Y = 28

B) 5X +5Y -1z =21
3X -2Y -4Z =48
4X -4Y -1Z =42

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exam Other Question

the square root of 2k+1 =17 If the probablility of tossing four pennies 96 times and all four landing on heads was 4/96, what is the probability all four will land on heads when you toss them 1,000,000 times.