Question
The names of 18 students from section A, 20 students
from section B and 19 students from section C were selected. The age of all the 57 students was different. Again, one name was selected from them, and it was found that it was of section C. What was the probability that it was the youngest student of the section B?Solution
The total number of students = 57 When 1 name was selected from 57 names, the probability that he was of section C = 19/57 = 1/3 But from the question, there are 19 students from the section C and the age of all 19 are different therefore, the probability of selecting one i.e. youngest student from 19 students will be 1/19.
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
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