exam Maths Puzzle

A box contains 10 balls out of which 3 are red and rest are blue. In how many ways can a random sample of 6 balls be drawn from the bag so that at the most 2 red balls are included in the sample and no sample has all the 6 balls of the same colour?

A.

105

B.

168

C.

189

D.

120

Read Solution (Total 1)

168 is the correct answer
9 years agoHelpfull: Yes(0) No(0)

exam Other Question

In a railway compartment, there are 2 rows of seats facing each other with accommodation for 5 in each, 4 wish to sit facing forward and 3 facing towards the rear while 3 others are indifferent. In how many ways can the 10 passengers be seated?

A.

172000

B.

12600

C.

45920

D.

43200 Out of eight crew members three particular members can sit only on the left side. Another two particular members can sit only on the right side. Find the number of ways in which the crew can be arranged so that four men can sit on each side.

A.

864

B.

863

C.

865

D.

1728