exam Maths Puzzle Numerical Ability

Find the GCF of the product.

(3b+6)(2b-10)

I got 3 for the first parenthesis and 5 for the second but you can only have one answer. What am I forgetting?

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exam Other Question

the augmented matrix

[1 3 2 | 4]
[2 -1 5 | -2]
[-3 1 6 | 1]


represents what system of equations.
there are 52 cards in a deck:
a.P(3 and black card)
b.P(3 or black card)