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Question

The value of 30r=16(r+2)(r3) is equal to:
  1. 7775  
  2. 7785    
  3. 7770   
  4. 7780    


Solution

The correct option is D 7780    
30r=16(r+2)(r3)
=30r=16(r2r6)
=30r=1(r2r6)15r=1(r2r6)
=(30×31×61630×3126×30)(15×16×31615×1626×15)
=88101030
=7780  

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