alleryThe contrapositive of If a number is divisible by 9, then it is divisible by 3 is:
ADivisible by 9 means also by 3
BNot divisible by 3 means not by 9
CNot divisible by 9 means not by 3
DDivisible by 3 means also by 9
Answer & Solution
Correct answer: B. Not divisible by 3 means not by 9
1. Negate both parts and reverse them.
2. Start from the failure of divisibility by 3.
3. So not divisible by 3 means not divisible by 9.
_Source: syllabus Mathematics, Chapter 14, Mathematical Reasoning._
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