Permutation and CombinationMedium
Question
How many four digits numbers can be formed with digits 1,2,3,4,5,6 when it includes 1 and 2 necessarily (Rept. not allowed) ?
Options
A.6
B.288
C.144
D.48
More Permutation and Combination Questions
The three sides AB, BC and CA of any ᐃABC are having 3, 4, and 5 internal points respectively. Then the number of ...The number of 4-letter words, with or without meaning, each consisting of two vowels and two consonants that can be form...A coin is tossed 10 times. In how many different ways can we obtain 5 head and 5 tail-...The number of ways in which 3 persons can occupy 6 rooms separately is-......