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Having chosen your four consecutive numbers you place $+$ and $-$ signs in between them.
You have three empty spaces, so how many possible combinations are there for arranging the $+$ and $-$ signs?
Are you sure you have found them all? How will you know?
Consecutive Numbers
Having chosen your four consecutive numbers you place $+$ and $-$ signs in between them.
You have three empty spaces, so how many possible combinations are there for arranging the $+$ and $-$ signs?
Are you sure you have found them all? How will you know?
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