Question

How many different 4 digit numbers are formed from 0,2,4,6 without repeating any digit in the number

Answer 1

Answer:

Hence, in this case there are 4 3 = 12 possible two digit numbers. For the third digit there are only 2 choices and for the last digit, one choice. Thus if you are not allowed to repeat a digit the number of possible 4 digit numbers you can construct from 1,2,3,4 is 4 3 2 1 = 24.

Step-by-step explanation:

Answer 2

The correct answer is 18... Quite simple based on permutations.. For the thousands place 3 digits are possible.. Since we can't repeat any digit, 3,2 and 1 digits are possible in the hundreds, tens and units place respectively.. By fundamental principle we get, total numbers formed =3*3*2*1=18