Que. A class comprises 4 girls n 5 boys. Every sunday 6 students go on an excursion,a different group being sent each week.During every excursion,each girl in the group is given a toy by the accompanying teacher.After all the possible groups of 6 have gone twice,the total number of toys the girls have got is:
Ans:options: 1)56 2)112 3)224 4)448
Que.In a colony the houses are numbered in a particular way.The first house has been numbered1!.Second house has been numbered1!+2!.Similarly nth house is numbered 1!+2!+3!.........n!. X person dicided to buy the house in this colony.But his wife has one condition that the number of house should be square of natural number.If X person is a blind follower of his wife how many options of houses does Xperson have?
Ans:option:1)1 2)2 3)3 4)More than 3
Plzzzz help me out i'm not getting these questions.
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Number of ways of selecting 6 students out of 9 (4boys and 5 girls) = C(9, 6) = 9! / (3! 6!) = 84
Total possible groups = 84 and each group has 6 students
So total number of students = 84 x 6 ; out of this there are 4 girls in each 9 students.(4 girl + 5 boys)
Thus total number of girls = 84 x 6 x 4/9 = 224
The total number of toys the girls have got is 224 x 2 = 448
I think the answer is 2
the two possible numbers are 9 = 1! + 2! + 3!
and 36 = 1! + 2! + 3! + 4!
n/a
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