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1. Mamun is twelfth from the left and Alam is fifteenth from the right in a row. If we interchange their positions, Alam becomes twentieth from right. How many boys are there in the row ?

  • A. 30
  • B. 30
  • C. 30
  • D. 30

Answer: Option B

Explanation:

Total number of boys in the row
=12+20-1 
=31
(ans)

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