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1. The missing number in the bracket 21 (9) 12, 24 (?) 9 is

  • A. 9
  • B. 9
  • C. 9
  • D. 9

Answer: Option D

Explanation:

21(9)12 [21-9=12]

24(?)9 [24-9=15]

Ans: 15.

 

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