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If A has 5 elements , n number of proper subset of A is
Solution:
Number of elements of A, `n=5`
So, the number of proper subset is
`=2^n-1`
`=2^5-1`
`=31`
If `A+B+C=pi`, then `cotAcotB+cotBcotC+cotCcotA` is equal to
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