# Recent questions tagged combinatory

3 votes
1 answer
1
The number of squares that can be formed from 8x8 chess board
3 votes
2 answers
2
The number of rectangles that can be formed on a 8x8 chessboard
3 votes
2 answers
3
Find the number of ways of inviting atleast one among 6 people to a party?
3 votes
1 answer
4
$N$ is a $4$ digit number If the left most digit is removed the resulting number is $\frac{1}{9}{th} \ of \ N$ How many such numbers are possible?
2 votes
0 answers
5
IA^B refers to A raised to the power B.Ten tickets numbered 1, 2, 3, ..., 10. Six tickets are selected at random one at a time with replacement. The probability of the largest number appearing on the selected ticket is 7 is -> a. (7^6 +1)/10^6 b. (7^6 - 6^6)/10^6 c. (7^6+6^6)/10^6 d. 6^6/10^6
1 vote
1 answer
6
Out of 100 students, 10 students used to drink milk(M), coffee(C) and Tea(T); 20M and C; 30C and T; 25M and T; 12M only; 5C only and 8T only. The number of students who did not drink any of this is a) 18 b) 24 c) 20 d) 16
0 votes
1 answer
7
Direction for the question given below The figure below shows the plan of a town. The streets are at right angles to each other. A rectangular park (P) is situated inside the town with a diagonal road running through it. There is also a prohibited region (D) in the ... at C, via B, taking the shortest path, then the number of possible shortest paths that she can choose is 1170 630 792 1200 936
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