Question
David is ranked 15th from the top in his class. When
counted from the bottom, he is ranked 126th. What is the total number of students in the class?Solution
Formula: (rank from top + rank from bottom - 1 = Total number of students in the class.) 15 + 126 - 1 = 141 – 1 = 140.
4, 8, 24, 96, 485, 2880, 20160
Find the wrong number in the given number series.
3, 6, 24, 120, 720, 5040
- Find the wrong number in the given number series.
30, 39, 23, 47, 12, 61 Find the wrong number in the given number series.
45, 68, 39, 70, 27, 74
123, 155, 198, 246, 301, 363Â
- Find the wrong number in the given number series.
4, 8, 24, 96, 480, 2880 Find the wrong number in the given number series.
- 342, - 218, - 96, 27, 150, 273
18, 19, 27, 54, 116, 243
4Â Â Â Â Â 6Â Â Â Â Â Â 12Â Â Â Â Â 30 Â Â Â Â Â Â 90 Â Â Â Â Â Â Â 310
...Find the wrong number in the given number series.
2, 3, 5, 7, 11, 13, 17, 20