Mathematics - Permutation & Combination Question with Solution | TestHub
MathematicsPermutation & CombinationFundamental PrincipleEasy2 minQB
MathematicsEasysingle choice
Passage / Comprehension
If there are two jobs such that one of them can be completed in m ways, and when it has been completed in any one of these m ways, second job can be completed in n ways; then the two jobs in succession can be completed in m × n ways
A letter lock consists of three rings each marked with fifteen different letters. It is found that a man could open the lock only after he makes half the number of possible unsuccessful attempts to open the lock. If each attempt takes 10 sec, the time he must have spent is not less than
Options:
Answer:
A
Solution:
Stream:JEESubject:MathematicsTopic:Permutation & CombinationSubtopic:Fundamental Principle
⏱ 2mℹ️ Source: QB
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