If 1+4=5, 2+5=12, and 3+6=21, then what is the value of 5+8? - Quora
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99% of people fail to answer 1+1=6, 2+5=7, 3+4=9, 6+8=8, 7+9=? Get more brain teaser puzzle, numb… | Maths puzzles, Brain teaser puzzles, Math puzzles brain teasers