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  1. Simplify 6 - [9 - {18 - (15 -12 - 9)}]
    1. 1
    2. 4
    3. 5
    4. 3
    5. None of the above
Correct Option: D

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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