exam Maths Puzzle Numerical Ability

THere are 10 pictures available to place on exhibit in a museum. How many arrangements (permutations) are possible if 7 pictures are selected at a time?

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exam Other Question

Please help.

Plot the graphs of TWO of the following four functions.f(x)=6x
1. f(x)=3x - 2
2. f(x)=(1/2)x
3. f(x)= log2x I know the perimeter is the measure around something but how do you find the perimeter of ABC if A= (2,6), B= (5,10) and C= (0,13)??? Help!!!