Explanation:
100/2[500/5{6+(21-17)}]
using BODMAS
100/2[500/5{6+4}]
100/2[500/5 × 10]
100/2 [100 × 10]
100/2 × 1000
50× 1000
50000
I think this is the answer. I'm not really sure but this is how I studied
All the best!
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