4,3,7=42 6,3,8=91 5,3,9=?? option 63,57,35,74
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Answer: 74
4,3,7=42 6,3,8=91 5,3,9=??
4,3,7=42
⇒7²-4²-3²=24 written as 42
638= 91
⇒ 8²-6²-3² = 19 written as 91
5,3,9=??
⇒9²-5²-3² = 47 written as 74
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