maths/permutation and combination

Find the number of ways, the digits 0,1,2 and 3 can be permuted to give rise to a number greater than 2000.
Please I need an explanatory workings!!!

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  1. You have to have the 2 or 3 as the first digit.

    After that, the other 3 digits can be done in 3! = 6 ways.

    So, the total is 2*3! = 12

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    posted by Steve

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