A) 120
B) 300
C) 420
D) 20
E) 42
Correct Answer: C
Solution :
If 0 be at the units place, then number of four digit even number \[{{=}^{6}}{{P}_{3}}=6\times 5\times 4=120\] If 2, 4 or 6 be at the units place, then number of four digit even number \[=3{{[}^{6}}{{P}_{3}}{{-}^{5}}{{P}_{2}}]\] \[=3[120-20]=300\] \[\therefore \]Total number of ways\[=300+120=420\]
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