Simplify the following and express with positive index :
[1 - {1 - (1 - n)-1}-1]-1
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If 2160 = 2a.3b.5c, find a, b and c. Hence, calculate the value of 3a × 2-b × 5-c.
If 1960 = 2a.5b.7c, calculate the value of 2-a.7b.5-c.