9 : 720 :: 10 : ?
  • a)
    9999
  • b)
    990
  • c)
    901
  • d)
    100
Correct answer is option 'B'. Can you explain this answer?

SSC Question

By Rahul Kumar · Jun 28, 2018 ·SSC
4 Answers
Mukull Pant answered Jun 29, 2018
(9*9*9)-9=720 [10*10*10)-10=990

Goswami Omdev answered Jun 28, 2018
9(9-1)10=720,10(10-1)10=990

Mukesh Kumar Sinha answered Jun 28, 2018
9(9-1)(9+1)=720 10(10-1)*(10+1)=990

Krishna Murari answered Jun 28, 2018
C

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