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Based on a certain logic, the numbers are related to each other. Find the number that must replace the ‘?’. 643 : 21 : 765 : 37 :: 284 : ?

Based on a certain logic, the numbers are related to each other. Find the number that must replace the ‘?’. 643 : 21 : 765 : 37 :: 284 : ?
QuestionBased on a certain logic, the numbers are related to each other. Find the number that must replace the ‘?’. 643 : 21 : 765 : 37 :: 284 : ?
Typemultiple_choice
Option21incorrect
Option15incorrect
Option24incorrect
Option12correct
Solution6 × 4 – 3 = 24 – 3 = 21
7 × 6 – 5 = 42 – 5 = 37
Similarly,
2 × 8 – 4 = 16 – 4 = 12
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