This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
If the whole world is happy, then it is likely that even you will be happy. One should not be selfish. if only you are happy you are not going to have anyone to share your happiness with. whereas if the whole world is happy, you can always laugh and share your happiness with them. no one wants to live in a world of sorrows and miseries. Happy world is what everyone wishes for. The world is like a mirror. 
3 3 3