exam Maths Puzzle Numerical Ability

Forward Gaussian Elimination is to the ____ method as backwards Gaussian
Elimination is to the ____ method.

a. induction, substitution
b. addition, substitution
c. induction,

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exam Other Question
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Jennifer is 6 years older than Sue. In 4 years, she will be twice as old as Sue was 5 years ago. Find their ages now. y=square root of 25-x^2