Why don't you try a little harder?
Why not try a little harder?
Why don't we try a little harder?
Let's try a little harder.
Let's try a little harder, shall we?
Shall we try a little harder?
How about trying a little harder?
What about trying a little harder?
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Do the sentences above have the same meaning?
1. Why not try a little harder?
2. Why don't you try a little harder?
3. Why don't we try a little harder?
Does #1 mean #2 or #3?