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adamC
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 Student
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Number of ways to choose + and - to make an equation correct
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Number of ways to choose + and - to make an equation correct
Yep! If I were to phrase it another way, how many ways can you choose $(c_1, ..., c_n) : c_i \in {-1, 1}$ and $\sum c_i \times a_i = b$
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 Editor
comment
Number of ways to choose + and - to make an equation correct
Forgot to mention that all $a_i$ must be non-zero.
revised
Number of ways to choose + and - to make an equation correct
added 9 characters in body
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Number of ways to choose + and - to make an equation correct