For a six digit number the most significant digit cannot be zero (it will otherwise cease to be a six digit number). So MS digit can be 1,2,3,4,5,6,7,8, or 9. The Other five digits can be 0,1,2,3,4,5,6,7,8, or 9. Hence total number of six digit numbers that can be made with 0 to 9 is
9 x 10 x 10 x 10 x 10 x 10 = 900000
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There is only 1 combination.
The number 0 represents nothing. The number zero was made because 'nothing' has to have a numerical value, just as 'something' does. The number 0 is just a representation of nothing.
Zero is a whole number and definition of monomial is " a number, or a variable, or a combination of a constant and a variable"
There are 10,000 four number combinations in the numbers 0 through 9. * * * * * No, that is simply not true. The combination 1234 is the same as the combination 2134 and 2314 and 1423 etc. So, there are just 8*7*6*5/(4*3*2*1) = 70 combinations.