exam Maths Puzzle Numerical Ability

A license plate has 6 positions for letters and numbers. The first two positions must be letters. The last four positions must be nonzero whole numbers. How many different license plates can be produced using this combination of letters and numbers?

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exam Other Question
find 2f(x) - f(x-1) for f(x)=3x^2 + 5 Looking to verify adding (or subtracting) logarithms to a single logarithm. I have: "log 5 250 - log 5 10". I believe that if they are the same base, you can simply substract the 250 from 10 to equal 240 (e.g. log 5 240). Right? Thanks in advance.