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Solution


Q.

The sum of all the four-digit numbers that can be formed using all the digits 2, 1, 2, 3 is equal to _________ .          [2023]

Ans.

(26664)

Sum of all unit place numbers

=3!×2+3!2!×3+3!2!×1=12+9+3=24

∴   Sum of all 4 digit numbers:

=1×24+10×24+100×24+1000×24

=24000+2400+240+24=26,664