GRE Exam Numerical Ability Permutation and Combination

From a box of 10 light bulbs, 4 are to be removed. How many different sets
of 4 bulbs could be removed?

Read Solution (Total 2)

10C4 = 210
14 years agoHelpfull: Yes(4) No(0)

10C4=210....as we can select any 4 from the given 10
11 years agoHelpfull: Yes(1) No(0)

GRE Other Question

How many 3-digit positive integers are odd and do not contain the digit '5'? A talent contest has 8 contestants. Judges must award prizes for first, second,
and third places. If there are no ties, (a) in how many different ways can the
3 prizes be awarded, and (b) how many different groups of 3 people can get
prizes?