exam Maths Puzzle Numerical Ability

How many four-digit numbers can be formed from the digits 0,1,2,3,4,5 if no repetitions are allowed and 0 cannot be the first digit?

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exam Other Question

46. B(2C –A)
Use the following matricies to compute above expression. State the dimensions of the resulting matrix.

[ 1 0] [3 -4]
A = [ 2 4]
A bank offers a savings bond with an interest rate of 8% per year compounded annually. How much money would an individual invest so that the value of the investment after 15 years is $7000?