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A 2 digit number with 2 different digits has a special property When the sum of the digits added to the product of it's digits the result is the number itself What is the smallest number with?
19
How Many Number combinations are there in 0-9?
9
What is a 2 digit number divisible by 19 The sum of the digits is 14 What is this number?
the answer is 95
How many unique 6 digit combinations with the same 6 numbers and 6 characters like 012345 and ABCDEF?
Total of 720 combinations:1 --- 12 --- 23 --- 64 --- 245 --- 1206 --- 7207 --- 5040.......Notice that:A --- BC --- DE --- FG --- XIn this sequence, if you wanted to know "X", it would be equal to FxG, and that is the key to this sequence. Why does it happen?Well, if, lets see, for instance, if 2 digits (0 and 1) have a possible of two combinations (10 and 01), then 3 digits (0, 1 and 2) will have a possible of six combinations: 012021And equivelent, but switching 0 with either 1 or 2, making it repeat itself 3 times.Eventually, we will end up doing 2 (number of combinations with 2 digits) times 3 (number of digits of which we want to know the number of unique combinations possible), totallizing 6 (our wanted-to-know number)
How many 4 number combinations are their using numbers 2-6?
If each number can be used only once then there are just four: 2345, 2346, 2456 and 3456. There are no others because the order of the digits does not matter in combinations.
