Permutations and Combinations-Derangement [JEE (Based on NTA Guidelines-IIT Engg.) Mains Mathematics]: Questions 1 - 2 of 2

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Question 1

Question MCQ▾

The number of ways in which 5 letters can be placed in 5 marked envelopes, so that no latter is in the right envelop is

Choices

Choice (4)Response

a.

44

b.

43

c.

45

d.

46

Edit

Question 2

Question MCQ▾

A person writes letters to five friends and addresses the corresponding envelopes. In how many can the letters be placed in the envelopes so that atleast three of them are wrong envelopes?

Choices

Choice (4)Response

a.

99

b.

129

c.

109

d.

119

Edit