exam Maths Puzzle Numerical Ability

6X-9Y+3Z
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3

WOULD I BE CORRECT IN THINKING THAT WOULD BE 2X-3Y+Z?

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exam Other Question

Two numbers a and b, are randomly selected without replacement from the set {2,3,4,5,6,7}. What is the probability that the fraction a/b is lessthan 1 and can be expressed as a terminating decimal?
Could you please explain this, Please? i dont get how to do these!!!!! help me!!!