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Question

By interchanging which two signs the equation 16 + 1 - 3 x 2 = 21 will be correct?

A
- and +
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B
+ and x
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C
x and -
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D
None of the above
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Solution

The correct option is A - and +
16 - 1 + 3 x 2

Interchange - and +

16 - 1 + 3 x 2
= 16 - 1 + 6
= 16 + 6 - 1
= 22 -1
= 21

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