- #1

planauts

- 86

- 0

## Homework Statement

http://puu.sh/1OfE2

## Homework Equations

## The Attempt at a Solution

I am not really sure about this one! :(

I think it's 1 because

http://puu.sh/1OfY0

http://puu.sh/1OfYE

I came up the number by working backwards (assuming the conclusion is true). However, for a proof, I cannot assume the conclusion is true and try proving the hypothesis. Could someone nudge me to the right direction in proving this statement?

Thanks!

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