A) 1225
B) 1252
C) 1522
D) 480
Correct Answer: D
Solution :
After fixing 1 at one position out of 4 places 3 places can be filled by \[^{7}{{P}_{3}}\] ways. But some numbers whose fourth digit is zero, so such type of ways = \[^{6}{{P}_{2}}\] \ Total ways = \[^{7}{{P}_{3}}\,-{{\,}^{6}}{{P}_{2}}\,=\,480\].
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