Just do it systematically, START WITH 0123 0124 0125 etc 0129 now 1234 1235 keep going! There are 10 numbers from 0 to 9. So the number of combinations of 4 digits numbers is 30. 10C4 = 10!/[(10 - 4)!4!] = 10!/(6!4!) = (10 x 9 x 8 x 7 x 6!)/(6! x 4 x 3 x 2 x 1)= 10 x 3 = 30
The four digit multiples of 1234 are:1234 (1234x1)2468 (1234x2)3702 (1234x3)4936 (1234x4)6170 (1234x5)7404 (1234x6)8638 (1234x7)9872 (1234x8)Multiplying 1234 by 9 give the 5 digit number 11106, so the largest 4 digit multiple of 1234 is 9872.
Oh, dude, 1234 times 2 is like, 2468. It's like doubling your money, but with numbers. So, if you had 1234 friends, and each one gave you 2 bucks, you'd be rolling in 2468 dollars. Math can be fun, right?
There are 24 combinations using each digit once per combination: 1234 1243 1324 1342 1423 1432 2134 2143 2314 2341 2413 2431 3124 3142 3214 3241 3412 3421 4123 4132 4213 4231 4312 and 4321.
1,234*4,321 = 5,332,114
There are only five combinations: 1234, 1235, 1245, 1345 and 2345.
There are twelve possible solutions using the rule you stated.
256
Just 4: 123, 124, 134 and 234. The order of the numbers does not matter with combinations. If it does, then they are permutations, not combinations.
24
4 of them. In a combination the order of the numbers does not matter.
It is 1234/9999.
4 x 3 x 2 ie 24
Since the order of the digits does not matter there are only five combinations: 1234, 1235, 1245, 1345 and 2345.
By the uniqueness of numbers, the only number for 1234 is 1234 itself.
1234, 1235 and 1236.
1234 is not a prime number.