Question

Simplify : 21 – [17 + {3 + (7 + 9 – 15)}]​

Answer 1

Step-by-step explanation:

$21 - (17 + (3 + (7 + 9 - 15)))$

$= 21 - (17 + (3 + 1))$

$= 21 - (17 + 4)$

$= 21 - 21$

$= 0$

Answer 2

Answer:

0

Step-by-step explanation:

21 – [17 + {3 + (7 + 9 – 15)}]

​=21 – [17 + {3 + (16 – 15)}]

=21 – [17 + {3 + (1)}]

​​=21 – [17 + {3 + 1)}]

​=21 – [17 + {4}]

​=21 – [17 +4]​

=21-21=0

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