Question
Rohan ranks seventh from the top and twenty sixth from
the bottom in a class. How many students are there in the class?Solution
ATQ, To find the total number of students in the class, you add the rank from the top and the rank from the bottom and then subtract 1 (to avoid double-counting the student at the intersection): Total number of students = Rank from the top + Rank from the bottom - 1 In this case:Â 
 So, there are 32 students in the class.
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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