Video explanation to a GRE problem solving practice question in permutation combination. An easy question.
Concept: n choose r. Sampling without replacement and where the order does not matter.
Question
In how many ways can 3 students be selected from a group of 12 students to represent a school in the inter school essay competition?
A. 33
B. 12!
C. 1320
D. 220
E. 36
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