Combi-Q

Which of the following is true?

• n C n = 1

• n C n-2 = n

• n C 1 = 0

• n C 0 = n

In a 10-item test in Mathematics, how many ways can you select 5 problems to answer?

• 525

• 252

• 225

• 255

A box contains 5 red balls and 2 green balls,. In how many ways can you select 5 balls if 3 are red?

• 1

• 5

• 10

• 15

What is the combination of 99 objects taken all at a time?

• 0

• 1

• 99

• 99!

Which of the following will make the equation C ( 11, r ) = 462 true?

• r=8

• r=7

• r=6

• r=11

Which is not a possible combination of n objects taken r at a time?

• 56

• 66

• 71

• 78

What is C (87, 85) ?

• 3471

• 3147

• 3411

• 3741

Which of the following does NOT belong to the group?

• Forming a line from 6 non collinear points

• listing the elements of a set

• distributing the papers alphabetically

• picking your a fruit in a basket

In how many ways can a committee of 6 be formed from 5 juniors and 7 seniors if the committee must have 3 seniors?

• 210

• 350

• 380

• 450

Comparison: C( 100, 98) is ______ C ( 100, 2) .

• greater than

• less than

• equal

• can not be determined