Question

How many 4 digit numbers can be formed with digits 0123?

Answer 1

Since there is no mention of repetition, we can assume that numbers can be repeated.

Thus any number can be used any number of times in ones, tens, hundreds, thousands place.

No of 4 digit numbers = 4×4×4×4 =256 numbers

Answer 2

the four digit number formed by 0123 are:●

• 1230
• 1203
• 1302
• 1320
• 1023
• 1032
• 2013
• 2130
• 2103
• 2310
• 2301
• 3120
• 3210
• 3102
• 3021
• 3012
• 3201