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Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving I. Single flag of different colours II. Any two flags in a different sequence of colours. III. three flags in a different sequence of colours. The maximum number of codes that can be generated is.
A. 6
B. 9
C. 15
D. 18
Permutations and Combinations · Easy · 3 weeks ago
A question paper consists of five problems, each problem having three internal choices. In how many ways can a candidate attempt one or more problems?
A. 63
B. 511
C. 1023
D. 15
Permutations and Combinations · Easy · 3 weeks ago
In a class there are 20 boys and 25 girls. In how many ways can a boy and a girl be selected?
A. 400
B. 500
C. 600
D. 20
Permutations and Combinations · Easy · 3 weeks ago
In how many ways can three consonants and two vowels be selected from the letters of the word “TRIANGLE”?
A. 25
B. 13
C. 40
D. 30
Permutations and Combinations · Easy · 3 weeks ago
A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag?
A. ⁹C₂
B. ³C₂
C. ¹⁶C₂
D. ¹²C₂
Permutations and Combinations · Easy · 3 weeks ago
How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9}
A. 60
B. 360
C. 120
D. 240
Permutations and Combinations · Easy · 3 weeks ago
How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?
A. 360
B. 60
C. 300
D. 180
Permutations and Combinations · Easy · 3 weeks ago
A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most__________?
A. 216
B. 243
C. 215
D. 729
Permutations and Combinations · Easy · 3 weeks ago
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