So, n = 15 i.e. number of persons in the party = 15.
Workspace
NA
SHSTTON
39
Solv. Corr.
34
Solv. In. Corr.
73
Attempted
0 M:0 S
Avg. Time
82 / 100
Choose the correct option.
A password consists of two letters of the alphabet followed by three digits chosen from 0 to 9. Repeats are allowed. How many different possible passwords are there?
For the first Letter you have 26 possible letters
For the second letter you have 26 possible letters
For the first number you have 10 possible numbers
For the second number you have 10 possible numbers
For the third number you have 10 possible numbers
Times all of the possibilities together to get:
26*26*10*10*10 = 676000
Which means their are 676,000 possible passwords
Workspace
NA
SHSTTON
12
Solv. Corr.
7
Solv. In. Corr.
19
Attempted
0 M:0 S
Avg. Time
83 / 100
Choose the correct option.
There are 20 persons sitting in a circle. In that there are 18 men and 2 sisters. How many arrangements are possible in which the two sisters are always separated by a man?
There are 10 person among whom two are brother. The total number of ways in which these persons can be seated around a round table so that exactly one person sit between the brothers , is equal to:
Two brothers can be arranged = 2 ways.
The way in the middle of 2 brothers, any of 8 other person can sit = 8 ways.
The rest 7 people can be arranged in 7! Ways.
So,Total = 7!*2*8
Workspace
NA
SHSTTON
7
Solv. Corr.
19
Solv. In. Corr.
26
Attempted
0 M:0 S
Avg. Time
87 / 100
Choose the correct option.
In a staircase , there are 10 steps . A child is attempting to climb the staircase. Each time, she can either make 1 or 2 steps. In how many different ways can she climb the staircase?
Child can clim in a+2b = 10 ways (a is 1 step and b is taking 2 steps)
So, if she is making 0 1steps den she has take 5 2steps for reaching 10th step den combination is 5c5 =1
Again for (2,4) : 6c4 =15
And for (4,3) : 7c3=35
For (6,2) : 8c2= 28
For (8,1) : 9c1 =9
For (10,0) 10c10=1
So total 1+15+35+28+1 = 89
Workspace
NA
SHSTTON
5
Solv. Corr.
11
Solv. In. Corr.
16
Attempted
0 M:0 S
Avg. Time
88 / 100
Choose the correct option.
What is the maximum value of n such that 146! is perfect divisible by 5n ?
There is a 3*3 matrix . you have 2 colors red and blue. In how many ways you can fill the colors in the boxes so that if u rotate the matrix by 180 degree we get the same matrix ?
for 3*3 matrix if we rotate 180 degrees , there are 32 ways
Workspace
NA
SHSTTON
17
Solv. Corr.
36
Solv. In. Corr.
53
Attempted
0 M:0 S
Avg. Time
90 / 100
Choose the correct option.
Find the no. of ways in which 4 particular persons a,b,c,d and 6 more persons can stand in a queue so that A always stand before B. B always stand before C, And C always stand before D.
Quantitative Aptitude Permutation and Combination Questions and Answers pdf
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