A swimming pool that holds 1200 gallons of water can be completely drained by a two pumps. The first pump is small and can only
1 answer:
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Solution:
The permutation formula is expressed as
The combination formula is expressed as
where
Given that 6 objects are taken at a time from 8, this implies that
Thus,
Number of permuations:
Number of combinations:
Hence, there are 28 combinations and 20160 permutations.