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Complete the series BB, FE, II, ML, PP, ...........by choosing one of the following option given :

  • A.TS
  • B.ST
  • C.RS
  • D.SR

Answer: A

The next pair is TS. Take the first letters B, F, I, M, P: the steps are +4, +3, +4, +3, so the next is +4, which gives T. Take the second letters B, E, I, L, P: the steps are +3, +4, +3, +4, so the next is +3, which gives S.

The pair is therefore TS. ST has the letters reversed, and RS and SR break the +4 step for the first letter, since R and S are only +2 and +3 from P. Writing the pairs out in order, BB, FE, II, ML, PP, TS, shows both alternating patterns running together.

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