Using the 10 digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, how many four digit numbers can be formed if the first digit must be an even number and each digit can only be used once (rounded off to zero decimals)? OA. 4! × 9! B. 4 x 8 x 7 x 5 OC. 2016 D. 10 x 9 x8 x 7

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