1q5 7!-6!
Questions from various materials n books : PERMUTATIONS & COMBINATIONS
{ I would continue adding qs in this forum everyday . }
3) There are 2 women participating in a chess tournment. Every participant played 2 games with the other participants. The number of games that the men played between themselves exceeded by 66 as compared to the number of games that the men played with the women. Find the number of participants & the total numbers of games played in the tournament.
5) 5 boys & 4 girls sit in a straight line. Find the number of ways in which they can be seated if 2 girls are together & the other 2 are also together but separate from the first 2.
15) A train going from Cambridge to London stops at nine intermediate stations. 6 persons enter the train during the journey with 6 different tickets of the same class. How many different sets of ticket may they have had?
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33 Answers
1for q 15 if no one enters from cambridge then 45 C 6
if they enter from cambridge then 55 c 6
