Question
Digits can get repeated?
Answer: Option D
:
D
When the repetition is allowed:All the places: Hundred’s, ten’s and unit’s can be filled by any of the digits: 2, 3, 5, 6, 7 or 8 i.e. in 6 ways. Thousand’s place can be filled only in 4 ways. Hence no. numbers possible = 4*6*6*6 = 864.Hence option (d)
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:
D
When the repetition is allowed:All the places: Hundred’s, ten’s and unit’s can be filled by any of the digits: 2, 3, 5, 6, 7 or 8 i.e. in 6 ways. Thousand’s place can be filled only in 4 ways. Hence no. numbers possible = 4*6*6*6 = 864.Hence option (d)
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