gokhlae distribution doubt

[k]

Q1_) Negative Binomial distribution is general case of :
a) Binomial Distribution
b) Geometric Distribution
c) Poisson Distribution
d) None of the above  

Q2) Which of the following discrete distribution has forgetfulness property?
a) Binomial Distribution
b) Poisson Distribution
c) Geometric Distribution
d) Exponential Distribution  

Q3)Geometric distribution is a particular case of
a) Binomial Distribution
b) Negative Binomial Distribution
c) Uniform Distribution
d) Hyper geometric Distribution

[laracroft]

1- B
2- B
3- B

[Target MA]

2-d

[manisha]

can anyone explain the questions asked above?

[Anjali]

OMG ! Do such questions actually come in the paper ?

[ashutosh]

2 should be b. poisson disstribution.
Exponential also has this property but it is in the case of continous.

[Shefali]

Does gokhale really asks these questions?

[SoniaKapoor]

Q3 anyone?

[Noel]

@sonia..its b

[manisha]

can you explain noel?

[Noel]

Sure..a negative binomial distribution has parameters (r,p) and is formulated as
(n-1)C(r-1)*p^r*(1-p)^(n-r)
geometric is just a particular case of this with parameters (1,p)..substitute the values of these parameters in the formula given above and you'll get the geometric ka formula

[Shefali]

Thanxx noel..i was also getting confused!

[manisha]

thanks noel