Question
There are 8 boys and 4 girls giving interview for a
job. If three of them are selected, then what is the probability that one of the three is a girl and the other two are the boys?Solution
Total Number of candidates = 12 Let ‘S’ be the Sample Space Then, n(S) = number of ways of three candidates who got selected n(S) = 12C3 = 220 Let ‘E’ be the event of 1 girl and 2 boys selected Therefore, n(E) = number of possibility of 1 girl out of 4 and 2 boys out of 8 n(E) = 4C1 × 8C2 = 4 × 28 = 112 Now the required Probability = 112/220 = 28/55
Complete the analogy.
49 : 65 :: 64 : ?
Select the related number from the given alternatives:
9 : ? :: 8 : 513
In a certain code language, ‘GARDEN’ is written as ‘FYOEGQ’ and ‘GOLDEN’ is written as ‘FMIEGQ’. How will ‘ISLAND’ be written in tha...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
If it was Saturday on 21st July 1928, then what was the day on 18 th March 1929?
The code for “life while going” is
If all the vowels in the word ‘USEFUL’ are changed to the next letter in the English alphabetical order and all the consonants remain the same then ...
In the question below some statements are given followed by three conclusions I, II and III. You have to take the given statements to be true even if t...
In a certain code RUMOUR is written as 49×794 and GRAM is written as #4@×. How will you write MARGO in that code?
A, B, C, D, E, F and G are seven friends having different heights. A is taller than C but shorter than B. C is taller than F but shorter than A. B is ta...
Relevant for Exams:
