exam Maths Puzzle Numerical Ability

How many license plates can be made of the form DDDLLLL, where D is a digit 0,......9 and L is a letter A,....z? What if symbols can be used only once each?

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exam Other Question

Given set C= (3,4,5,6), which of the following is TRUE:

a. C={xlx e N and x<6}
b. C= {xlx e N and 2<x<7}
c. n(C)=5
d. All of the Above How do you graph the following:
y= 0.5x(squared) - 2.24x - 1.4
AND
y= 0.08x(cubed) - 1.62x(squared) + 6.72x