exam Maths Puzzle Numerical Ability

find 2f(x) - f(x-1) for f(x)=3x^2 + 5

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exam Other Question

calculate this factorial 140! 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?