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noidea noidea
  • 16-07-2015
  • Mathematics
Answered

how many numbers are equal to the sum of two odd, one digit numbers

Verified Answer :

bobeld
bobeld bobeld
  • 16-07-2015

Here is a list of the odd number paired

1+3, 1+5, !+7, and !+9  (there are 4 unique sums - 4, 6,8 and 10)
3+5, 3+7, 3+9  (notice I did not pair 3 with 1 and the the only new sum is 12)
5+7, 5+9  (the only new sum is 14)
7+9  (16 is a new sum)

The sums (no repeats) are 4,6,8,10,12,14 and 16 for a total of seven numbers.

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