Question

: What is the sum of all four digit numbers formed by using the digits 0, 1, 2,
3 only once in each number?​

Answer 1

Answer:

38664

Step-by-step explanation:

38664

Theno.canbewrittenas

3×3×2×1=18

because0cannotbefilledatfirst

3

18

​  

=6

sumofno.atIplace=6

6×(1+2+3)=36

sumofno.atIIplace=6

6×0+4(1+2+3)=24

sumofno.atIIIplace=6

6×0+4(1+2+3)=

sumofno.atIVplace

6×0+4(1+2+3)=24

36×1000=36000

24×100=2400

24×10=240

24×1=24

=38664

​  

 Hence, this is the answer.

Answer 2

The four digit nos formed from digits 0,1,2&3 not 'repeated':

1023

1032

1203

1230

1320

1302

Similarly,,

2013

2031

2103

2130

2310

2301

Similarly..

3012

3021

3201

3210

3102

3120

Add all nos you will get the ans.....