exam Maths Puzzle Numerical Ability

square root 15 - square root 3/5

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exam Other Question

how many permutations are there of the letters in the word "distinction"? hey i got stuck halfway through this one:

5/6ab-7/8a

this is what i got:

i found the Least Common Denominator=24ab
multiplied it out to get

20-21b/24ab and im not sure how to simplify from here. Whattya think?