Urgent help

[Taanya]

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[taanya]

i am having a lot of trouble with these questions... someone please be a doll and help out!!thanks:):)

[Abhinav]

'X implies Y' means that if X is true then Y has to be true. But if X is false then there is no information of Y ...it can True or False.
Conversely if we look at it from Y side, if we know that Y is true then we cannot be sure that whether X is true or False..but if Y is false then we are sure that X has to be false.