exam Maths Puzzle Numerical Ability

A bookstore makes a profit of $2.50 on each book they sell, and $0.75 on each magazine they sell. Each week the store sells x books and y magazines. Let $P be the weekly profit, an

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I need help mulitplying this: (√[6] + 2√[2])(4√[6] � 3√[2]) (1)In how many ways can 2 letters be selected from set={a,b,c,d} when repitition of letters is allowed?
(a)if order of letters matters
(b)if order of letters doesn't matters

(