exam Maths Puzzle Numerical Ability

In how many ways can three students be seated in a row of five desks?

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exam Other Question

sqrt(2x+3) - sqrt(x+1) = 1, solve for x ( could be 2 solutions) A grocery store sells a mixture of peanuts and raisins for $1.75 per pound. If peanuts cost $1.25 per pound and raisins cost $2.75 per pound, what amount of raisins ans peanuts go into 1 pound of the mixture?