13_46_8_180_210_75 = 64 . Use + and - in the empty places to make the equation holds good. Take m = number of + and n = number of - . Find m - n?
-1
1
0
-2
Explanation:
13 - 46 - 8 - 180 + 210 + 75 = 64
m = 3
n = 4
m - n = - 1.
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