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total number of students = total number of seats.

1) not sufficient. Feasible probability=1/3; 1/5; 1/7 etc.

2) tells us that total seats are 13, total students are 13. The probability that a student ends up in one chair is 1/13. Suff

answer B
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Hi

(i) We just know that N is odd and prime. it can be any no. 5,7 etc >> not sufficient.
(ii) Any other student on the right > P = 1/13

P of Beth is on the right 1 - P of any other child on right = 1- 1/13

SUFFICIENT >> ANSWER B
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Hello from the GMAT Club BumpBot!

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