A) 100
B) 90
C) 120
D) 80
Correct Answer: A
Solution :
Required number of ways = \[^{6}{{P}_{3}}{{-}^{5}}{{P}_{2}}=120-20=100\]. {Since between 99 and 1000, the numbers are of 3 digits, but those numbers should be omit in which ?0? comes at hundred place}.
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