Answer:
A. 21 or B. 21
Step-by-step explanation:
9+10=21 is an incorrect answer to a math problem, which was first spoken online in a Vine video. The video, also known as "What's Nine Plus Ten," quickly became a fad within the Vine community, leading to remixes and other parody, and later spreading to various other internet communities. In Summer 2019, the video saw a resurgence in popularity on Instagram, Twitter and iFunny.
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