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1 "If the pudding is a custard, then Madison will eat it." or "Madison will eat the pudding if it is a custard."
--The sentence DOES NOT STATE whether she eats other kinds of pudding.
--She eats a custard for sure.
2 "Only if the pudding is a custard, will Madison eat it." or "Madison will eat the pudding only if it is a custard."
--The sentence tells us that she DOES NOT EAT other kinds of pudding.
--BUT if a custard is available , she MAY NOT eat -e.g. she is full.
3 "If and only if the pudding is a custard, will Madison eat it." or "Madison will eat the pudding if and only if it is a custard."
--The sentence tells that she EATS only custards
--AND if a custard is available, SHE WILL absolutely EAT it.
: )
I m not so sure na kub.
| จากคุณ |
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JohnnieWalker  
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| เขียนเมื่อ |
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16 ก.ค. 52 22:38:43
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[LOGICAL PROBLEM] ความแตกต่างของ If , Only if และ If and only if คืออะไรครับ
