a) 40P6 × 6!
b) 6P4 × 2!
c) 10 × 95
d) 4 × 35
Answer: d
Explanation: First place can be filled in 4 ways.
The subsequent places can be filled in 3 ways each.
Hence, the number of ways
= 4 × 3 × 3 × 3 × 3 × 3
= 4 × 35
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