Friday

September 19, 2014

September 19, 2014

Posted by **Jas** on Sunday, February 17, 2008 at 11:43am.

five ways, such as 1 + 2 + 1 and 1 + 1 + 2. Show all the ways that

the positive integer 5 can be represented as a sum of 1's or 2's.

- math -
**Reiny**, Sunday, February 17, 2008 at 1:14pmI can express 5 the following way

a)all 1's no 2's --- that's 1 way

b)three 1's one 2 --- thats' 4 ways

(the 2 can be in 4 different places, eg

1+1+2+1 or 1+2+1+1)

c) two 2' and one 1 --- that's 3 ways

which is a total of 8

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