How many 4 digits number can be formed using 0, 1, 2, 3, 4, 5, 6. If digits can be used only once.
A) 480
B) 720
C) 2058
D) 640
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720 is right answer for it...
beacuse first digit place We have 6 choice except (0) second have also 6 choice inculed 0 again 5 and 4
6×6×5×4=720
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