Question
A bouquet of 3 flowers is to be made out of 3 roses and
2 lilies. What is the probability that the bouquet has at least one lily?Solution
Total number of flowers = 3 + 2 =5 Let S be the sample space. Then, n(S) = total number of ways of selecting 3 flowers out of 5 = 5C3 = (5x4x3!)/(3!x2x1) = 10 Let E= event of selecting 3 flowers when none is a lily n(E) = 3C3 = 1 P (E) when none of the flowers is a lily = 1/10 P (E) when at least one flower is a lily = 1 - 1/10 = 9/10
Find the wrong number in the given series.
12, 18, 27, 42, 62, 87
24, 12, 18, ?, 157.5, 708.75
3601 3602 1803 604 154 36
...60000 2400 120 8 0.8 ?
...2,0, 9, 20, ‘?’, 714
40 30 20 ? 7.5 4.375
Select the number from among the given options that can replace the question mark (?) in the following series.
8, 27, 64, 125, 216, ?
104Â Â Â Â Â Â 156Â Â Â Â Â Â Â 234Â Â Â Â Â Â Â ? Â Â Â Â Â Â Â 526.5Â Â Â Â Â Â Â 789.75
...15, 65, 165, 315, ?, 765
7 12 33 ? 635 3804
...
Relevant for Exams:
