1.

The sum of all 4 digit numbers formed by using `2, 3, 4` and 7 repetition of digits os not allowed, belongs to the interval :A. `(106000, 106300)`B. `(106300, 106600)`C. `(106600, 106900)`D. `(106900, oo)`

Answer» Correct Answer - C
The sum of all ………
`(4!)/(4) (2+3+4+7)(10^(0)+10^(1)+10^(2)+10^(3))`
`= (24)/(4)(16)(1111) = 106656`


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