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Simplify 6 - [9 - {18 - (15 -12 - 9)}]

1
4
5
3

Correct Answer: 3

Explanation:

Given expression
= 6 - [9 - {18 - (15 -12 - 9)}]
= 6 - [9 - {18 - (15 - 12 + 9)}]
= 6 - [9 - {18 - 12}]
= 6 - [9 - 6] = 6 - 3 = 3

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