Answered

(a) Find the sum of all 4 digit numbers that can be made using the digits 1, 2, 3 and 4 without restriction. (include working out) (b) Find the sum of all 4 digit numbers that can be made using the digits 1, 2, 3 and 4 without repetition. (Include working out) do both questions pls



Answer :

Answer:

66,660

Step-by-step explanation:

There are 4! ( = 4*3*2*1 = 24) ways of arranging the digits 1 2 3 and 4:

4321

4312

4231

4213

4123

4132     Sum = 25332

3124

3142

3214

3241

3412

3421  Sum = 19554

2134

2143

2314

2341

2413

2431  Sum = 13776

1234

1243

1324

1342

1423

1432   Sum = 7998

Which sums to 66,660

Other Questions