What the answer of this

Question

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Answer 1

You should go through the lesson again.

Answer 2

Eman Yassin i don't get what you mean by "how", didn't you went through the following lesson ?

https://www.sololearn.com/learning/1026/

And as an advise , you should make use of search engines like google as well if you can.

Answer 3

How

Answer 4

Thank you very much