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Someone’s help me please

Someone’s help me please-example-1

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A Relation is said to be a Function if an element of Domain of the Function has one and only one image in the Co-domain of the Function.

⇒ A is not a Function, Because Element 4 has Three images

⇒ B is a Function, Because Each Element has a Unique Image

⇒ C is not a Function, Because Element 7 has Two images

⇒ D is a Function, Because Each Element has a Unique Image

⇒ E is a Function, Because Each Element has a Unique Image

So, The Relations which are Functions are : B - D - E

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