# If you have 9 numbers how many different 6 digit combinations?

We treat this as a permutations and combinations problem... as there are two possible 'rules' involved.

If we are allowed to **repeat** a digit (such as 456537 -
which as two 5s in it) then there are 9 options for every digit. So
9 x 9 x 9 x 9 x 9 x 9 = **531441** different six-digit numbers
from a choice of 9.

If we **cannot repeat** a digit, as we did above, thee need
to pick the first number - and it can be any of the 9.. then the
second number can be any of 8, and the third can be any of 7 and so
on.... this is called permutations and we end up with a
multiplication like before but with each figure lower than the one
before it.... 9 * 8 * 7 * 6 * 5 * 4 = **60480** different
permutations of six digits from a choice of 9.

### How many 5 digit combos in 30 numbers?

The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600…

### How many 5 digit combinations for numbers 1- 25?

There are 9 1-digit numbers and 16-2 digit numbers. So a 5 digit combination is obtained as: Five 1-digit numbers and no 2-digit numbers: 126 combinations Three 1-digit numbers and one 2-digit number: 1344 combinations One 1-digit numbers and two 2-digit numbers: 1080 combinations That makes a total of 2550 combinations. This scheme does not differentiate between {13, 24, 5} and {1, 2, 3, 4, 5}. Adjusting for that would complicate the calculation considerably and…

### How many 4 digit combinations can be made from 6 digits?

If the 6 digits can be repeated, there are 1296 different combinations. If you cannot repeat digits in the combination there are 360 different combinations. * * * * * No. That is the number of PERMUTATIONS, not COMBINATIONS. If you have 6 different digits, you can make only 15 4-digit combinations from them.

### How many different combinations of four numbers are there?

9999 + 1 * * * * * That is so wrong! There are 10*9*8*7/(4*3*2*1) = 210 combinations of 4 numbers from the set of ten 1-digit numbers, 0 1, 2, ... 9 When considering combinations, 1234 is the same as 2314 or 4123 etc. Actually... 4 numbers to be arranged with ten different possibilities each will give a total of 10^4 combinations, or 10,000.

### How many four number combinations can be made from ten different numbers?

Given that 'ten different numbers' is all of them.. then including 0000, there will naturally be 10,000 combinations. * * * * * " ... there will naturally be 10,000" only if you don't know the difference between permutations and combinations. Orders do not affect combinations so that 1234 is the same as 4321, 1432, etc. The number of 4-digit combinations is (10*9*8*7)/(4*3*2*1) = 210