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A typist was appointed in Correct technology services and she was asked to prepare 23 letters addressed to different people and prepare 23 covers addressed to them. She inserts these letters at random into the envelopes. (one letter per envelope). What is the probability that exactly one letter is inserted to the wrong envelope?

a)7/23 b)9/23 c)0 d)11/23

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Wipro Other Question
In how many different ways can a group of 4 boys and 2 girls be made out of a total of 8 boys and 4 girls?

a 240 b) 360 c) 280 d)420 Adhvaith can do a certain work in 30 days. Kashyap can do same work in 25 days. Adhvaith started the work and worked for 9 days. Kashyap came and joined to do the work from the 10th day. How many more days would they have taken together to complete the work?

a)10 3/11 days b)11 2/11 days c) 9 6/11 days d) 8 2/11 days