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Subject: Maths, asked on 24/12/17

If n(P)r = n(P)r+1 and n(C)r = n(C)r - 1. Find the value of n and r.

Subject: Maths, asked on 8/12/17

In how many ways can 5 white balls and 4 Black balls be arranged in a row so that no two black balls are together? plss no links

Subject: Maths, asked on 5/12/17

Please answer fast .Thanks in advance

22.  If n2-nC2 = n2-nC10, then n equals (A)  12                                                       (B)  4 only(3)  -3 only                                             (D)  4 or -3

 

Subject: Maths, asked on 4/12/17

The number of integral solutions abc = 30 is
(A) 27                       (B) 108                       (C) 81                       (D) 54

Subject: Maths, asked on 4/12/17

Please solve Q 88 with proper explanation.

​Q88. In how many ways can 3 sovereigns be given when there are 4 applicants and any applicant may have either 0, 1 , 2 or 3 sovereigns ?

    (A) 15                    (B) 20                     (C) 24                    (D) 48

Subject: Maths, asked on 4/12/17

In an election, a voter may vote for any number of candidates, not greater than the number to be
elected. There are 10 candidates and 4 are to be elected. If a voter votes for at-least one
candidate, then the number of ways in which he can vote, is
(A) 385                  (B) 1110               (C) 5040                 (D) 6210

Subject: Maths, asked on 4/12/17

Please solve Q 80 with proper explanation.

​Q80. If there are four different colour balls and 4 different boxes of respective colour. Each box is capable of holding only one ball. The no. of ways of distributing there balls into boxes in such a way that exactly one ball goes to its own colour box is

   (A) 6                              (B) 9                               (C) 7                          (D) 8 

Subject: Maths, asked on 4/12/17

Number of non-negative integral solution of the equation x + 2y + z = 10 is
(A) 36                        (B) 32                       (C) 34                         (D) 30

Subject: Maths, asked on 4/12/17

Please solve Q 78 with proper explanation.

​Q78. The no. of zeroes in the end of 99! is 
       
          (A) 19                     (B) 20                  (C) 21                (D) 22
 

Subject: Maths, asked on 4/12/17

Please solve Q 71 with proper explanation.

​Q71. The no. of integral solutions of x2 + y2 = x2y2 is 

         
          (A)  0                     (B) 1                      (C) 2                          (D) 3
 

Subject: Maths, asked on 4/12/17

No. of divisor of 1200 in form of 4n + 2(n ≥ 0) is
(A) 10                        (B) 6                  (C) 8                        (D) 12

Subject: Maths, asked on 4/12/17

The number of (+ve) integral solution of the equation x1x2x3x4x5 = 1050 is
(A) 1800                  (B) 1600                    (C) 1400                  (D) 1875

Subject: Maths, asked on 3/12/17

​ 100 people starting from 1 to 100 have to change alter the position of 100 closed doors such that a person can only alter a door that can be divided by the number that he has been assigned. at last how many doors will be open?

Subject: Maths, asked on 24/11/17

Example 27: In an examination hall there are four rows of chair. Each row has 8 chairs one behind the other. There are two classes sitting for examination with 16 students in each class. It is desired that in each row all students belong to the same class and that no two adjacent rows are allotted to the same class. In how many ways can these 32 students be seated.

Subject: Maths, asked on 24/11/17

∑ (-1)r+1   nCr/r

34567
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