Q1. In how many ways can 4 books be selected out of 16 books on different subjects?
a. 34650
b. 43680
c. 43890
d. None of these
Q2. In a group of 50 people, 35 people speak hindi, 25 people speak both hindi and English, and all the people speak at least one of the two lanyqages. The number of people who speak English is
a. 45
b. 40
c. 15
d. 30
Q3. From among 6 couples, a committee of five members is to be formed. If the selected committee has no couple, then in how many ways can the committee be formed?
a. 6
b. 792
c. 40
d. 192
Q4. In how many ways can four similar cell phones be distributed among 10 boys so that no boy receives more than one cell phone?
a. 2880
b. 210 ->
c. 4^10
d. 10^4
e. 840
Q5. A mini cricket team consisting of 8 players, of which one is a wicketkeeper, is to be selected from a group of 13 players – 5 bowlers, 7 batsmen and 1 wicketkeeper. Given the number of bowlers, the number of ways selecting the team is 175; then, the team consists of :
a. 5 bowlers
b. 4 batsmen
c. 3 batsmen
d. 4 bowlers
e. None of these
Q6. In how many ways can 8 distinct things can be divided among three people such that any one can receive any number of things?
a. 1556
b. 6561
c. C( 8,2)
d. C(7, 2)
Q7. Five balls of different are to be placed in three boxes of different sizes. Each box can hold all five balls. In how many different ways can we place the balls so that no box remain empty
a. 119
b. 150
c. 180
d. 210
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Sol.:
16 x 15 x 14 x13 = 43680
So option (b) is correct...
Giv ur best to d world.
Nd d bestwil cm back to u....
Regards,
Dipanjan.....
n/a
Sol.
By using De Morgan's Theorem:
Total no. of ppl=ppl speak Hindi + ppl speak English - ppl speak both
=>50=35+E-25
=>E=40
So option(b) is correct...
Giv ur best to d world.
Nd d best will cm back to u....
Regards,
Dipanjan.....
n/a
Soln.:Total no. of ways=6C5x2 + 6C1x6C4x2 + 6C2x6C3x2 = 12+180+600=792..
So Option (b) is correct...
Giv ur best to d world.
Nd d best will cm back to u...
Regards,
Dipanjan.....
n/a
Soln:As no boy receives more than one cell phone..Dn its just a matter to find out d ways by means of which we have to select 4 boys out of 10....
No. of ways:10c4=210
So Option (b) is correct...
Giv ur best to d world.
Nd d best will cm back to u..
Regards,
Dipanjan......
n/a
Soln.
Let d team has n bowlers.Dn shud have (7-n) batsmen[As 1 wicketkeeper shud be selected]
Accordin to d qs:
5Cn * 7C(7-n) =175
=>n=4
The team has 4 bowlers...
So option (d) is correct....
Giv ur best to d world.
Nd d best will cmback to u....
Regards,
Dipanjan.....
n/a