145/13+ 57/11- 31/9 = 11 + 5 – 3.5 = 12.5 ≈ 13
How many straight lines can be formed from 9 points out of which 4 are colinear?
5 persons P, Q, R, S, and T are sitting around a round table. How many times can they sit in different ways so that Q and T do not sit together?
In how ways can the selection be made so that a particular member is always excluded?
A bag contains 4 violet, 2 grey and 6 black pullovers. 3 pullovers are chosen at random. What is the probability that at least 2 pullovers chosen will b...
In how many different ways can 4 blue beads and 3 red beads be arranged in a row such that all the blue beads are together and all the red beads are tog...
In a Group of 8 boys and 6 girls, Six children are to be selected. In how many different ways can they be selected such that at least one boy should be ...
In how many different ways can the letter of the word ‘PRAISE’ be arranged?
In how many different ways can the letters of the word 'COMPUTER' be arranged in such a way that the vowels always come together?
An examinee is required to answer the eight questions out of 16 questions which are divided into two groups each containing eight questions each and he...
From 6 officers and 8 Jawans, in how many ways can 5 be chosen to include exactly 3 officers?
