Questions
There are 10 lamps in a hall. Each one of them can be switched on independently. Find the number of ways in which hail can be illuminated.
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a
210−2
b
210−1
c
210+1
d
None of these
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Correct option is B
Total number of ways=10C1+10C2+10C3+10C4+10C5+10C6+…+10C10=210−1 ∵nC0+nC1+nc2+…=2nSimilar Questions
is equal to
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