Other Interview Numerical Ability Probability

A,B and C are among 15 speakers in the mobile world conference .what is the probability that A speaks before B and B speaks before C.

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Other Other Question

can anyone tell me..what is the syllabus of aptitude for MCA in AMCAT EXAM Jack, twenty one years old, is three times as old as his brother. How old will Jack be when he is
twice as old as his brother?