- View Source1) The 2 is dumped bcos thr r 2 cases in which either

1'st or 2'nd student gets all three prizes, which is

against the condition that exactly two dont get

prizes.

2) Answer = Prob(two head) + Prob(three heads) +

Prob(four heads)

or

Answer = 1 - Prob(one head)- Prob(no heads)

=1-(4/16)-(1/16)

=11/16

--- Anil kumar Babu <anil.babu@...> wrote:

---------------------------------

Hi

The following are questions from an institute book.

1)Three different prizes are to be distributed among 4

different

students. Each student can get 0 to 3 prizes. If all

prizes are

distributed, find ways possible such that exactly 2

students do not

receive a prize.

4C2 * 2^3 is my answer but the solution set indicates

4C2(2^3 - 2).

I dont understand why that 2 should be dumped.

2) What is the probability that we get atleast 2 heads

when 4 coins

are thrown simultaneously?

Explanations please.

Regards

Anil

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Go to: http://yahoo.naukri.com/ - View SourceI am getting the answer to the 3rd question 1:1:1

sp after profit of 20% =15.60

thus sp without profit=13

thus using alligation

10 17

13

4 3

4:3

12 17

13

4 1

4:1

thus final ratio

4:4:(3+1)

= 1:1:1

--- In ascent4cat@yahoogroups.com, vinu chandran <vinu12120@y...> wrote:

> hii...

> 1. ie 1 cc --> 34 words..

> if i litre = 1000cc => .568litre = 568 cc..

> so answer = 568 * 34 = some no. ending in 2..as there

> is only 1 such option..ie 19312... go 4 it.. :D

>

> 2. dats 16% matter in grapes n 80% matter in raisins..

> so .16 * 80 matter multiplied by 1.25 2 get raisins..

> so answer = .16*80*1.25 = 16kg

>

> 3.--- sanoop unni <sanoop_u@y...> wrote:

>

> >

> > solve this:

> > 1) 10 cu.cm of ink can write ,on an average,340

> > words

> > ,how many can one write with 0.568 litres of ink?

> > (a)4828 (b)8484 (c) 19312 (d) 24467

> >

> > 2) Fresh grapes contain 84% water while raisins

> > contain 20% water.how many Kg of raisins can be made

> > from

> > 80 Kg of grapes?

> > (a)16 kg (b) 18 kg (c) 20 kg (d) 22 kg

> >

> > 3) A shop keeper mixes 3 varieties of rice costing

> > Rs

> > 10,12,17 per Kg.In what ratio should they be mixed

> > so

> > that the

> > resulting mixture can be sold at Rs 15.60 per kg

> > making 20% profit?

> > (a) 9:14:36 (b) 11:14:25 (c) 14:36:43 (d) 2:6:3

> >

> >

> >

> >

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