Question

Ten persons, amongst whom are A, B and C, are to speak at a function. If n is the number of ways in which it can be done if A wants to speak before B, and B wants to speak before C find n/800.

Solution

Correct option is

756

Places for AB and C can be chosen in 10Cways. The remaining 7 persons can speak in 7! Ways. 

    

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SIMILAR QUESTIONS

Q1

A class contains 4 boys and g girls. Every Sunday five students, including at least three boys go for a picnic to Appu Ghar, a different group being sent every week. During, the picnic, the class teacher gives each girl in the group a doll. If the total number of dolls distributed was 85, then value of g is    

Q2

The sum of the factors of 9! Which are odd and are of the form 3m + 2, where m is a natural number is 

Q3

Sum of all three digit numbers (no digit being zero) having the property that all digit are perfect squares, is

Q4

Let S = {1, 2, 3, ... n}. if X denote the set of all subsets of S containing exactly two elements, then the value of   

Q5

Let a be a factor of 120, then the number of integral solution of x1x2x3 = a is 

Q6

There are 15 points in a plane of which exactly 8 are collinear. Find the number of straight lines obtained by joining there points.   

Q7

If n is the number of ways in which an examiner can assign 30 marks to 8 questions, giving not less than 2 marks to any quation find n/40.

Q8

Find the number of rectangles that you can find on a chessboard.

Q9

Find the number of integers greater than 7000 that can be formed with the digits 3, 5, 7, 8 and 9, no digit being repeated.

Q10

Find the largest  such that