Math

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What do the digits in the number 15 add up to? Answer 1+5=___.
Using single digits, how many different ways can you add up to 6?.

Example:
The least number of digits is 2, and it is 1+5=6. The greatest number of digits is 6, and it is 1+1+1+1+1+1=6.

1.How many other numbers have digits with the same total 6, if we only include numbers without zeros?___
2.What is the total number of ways you can arrange a sum of 6?____

Hint:Do your work in a logical way,i.e. start off with using only 2 digits, then 3,then 4 and so on.

  • Math -

    One digit numbers: 6 (one possibility only)

    Two digit non-zero numbers:
    15, 24, 33, 42 and 51 (total = 5)

    Three digit numbers:
    123, 213, 132, 312, 321, 231
    114, 411, 141, 222 (total = 10)

    Four digit numbers:
    1113, 1131, 1311, 3111
    1221, 2121, 1122, 2211
    2112, 1212 (total = 10)

    Five digit numbers:
    11112, 11121, 11211, 12111, 21111
    (5 numbers)

    Six digit numbers: 111111 (one only)
    Total number of possibile arrangements = 32 (without using zero)

    Sum of 1: One possibility (1)
    Sum of 2: Two possibilites (2,11)
    Sum of 3: Four possibilities
    (111, 12, 21, 3)
    Sum of 4: (Eight possibilities.
    (4, 13, 31, 22, 112, 121, 211, 1111)
    Thus for a sum of five there are 16 possibilities.
    For a sum of N there are 2^(N-1) possibilities.

  • Math -

    How to solve x+7y=8 8x-4y=-2

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