Confused with sufficient and necessary condition

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Homework Statement




i know that "A is necessary for B" means "B implies A".

but i confused with the word "A is necessary of B" somebody help
 
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annoymage said:

Homework Statement




i know that "A is necessary for B" means "B implies A".

but i confused with the word "A is necessary of B" somebody help
Take a look here.
 

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