1400 saal Pehle Mathematics ka jo Formula HAZRAT ALI ne dia woh aaj tak koi rad na karsaka
1) Tumhare Dost ka Dost Tumhara Dost
+ + = +
2) Tumhare Dost ka Dushman Tumhara Dushman
+ - = -
3) Tumhare Dushman ka Dushman Tumhara Dost
- - = +
4) Tumhare Dushman ka Dost Tumhara Dushman
- + = -
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