Question
In how ways can the selection be made so that a
particular member is always included? There are 5 members in a delegation which is to be sent abroad. The total no. of members is 11.Solution
As the person is always included, therefore, ∴ C_1 × 10C_4 = 1 × (10 × 9 × 8 × 7)/(4 × 3 × 2) = 210
More Permutation and combination Questions
Find the wrong no in the given number series.
2, 4, 8, 16, 33, 64
2, 12, 36, 80, 150, 252
Find the wrong number in the given number series.
3600, 1440, 576, 230.4, 92.24, 36.864
45, 125, 214, 312, 420, 535
- Find the wrong number in the series.
1, 8, 27, 65, 125, 216, 343 - Find the wrong number in the given number series.
600, 539, 488, 447, 408, 395 Find the wrong number in the given number series.
204, 215, 277, 337, 416, 518The series given below contains a sequence of numbers.
Accordingly identify the incorrect number.
9, 14, 24, 38, 59
21, 23, 27, 35, 51, 87Â
275, 50, 165, 33, 99, 19.8, 59.4
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