Maths & Physics Help

[sonali]

ok bt hw do u get to d ans 26/27
i still dnt get it

[astarmathsandphysics]

1 - 1/3x1/3x1/3.
1/3x1/3x1/3 is the probability that the goalie saves all the shots, so the question must be, "what is the pronanility that the goali does not save all the shots?"

[sonali]

1 - 1/3x1/3x1/3.
1/3x1/3x1/3 is the probability that the goalie saves all the shots, so the question must be, "what is the pronanility that the goali does not save all the shots?"

yeah got it thxfully
another sum need yr help
srry bt plz do help
its easy bt still i am unable to figure it out
q. a normal pack of 52 cards is shuffled and three cards picked at random. calculate d probability tht all three cards are picture cards.
n ya require notes on d topic the angle between d line n a plane

[astarmathsandphysics]

There are 12 picure cards

Prob of 1srt being picture card =12/52
prob of 2nd being picture card =11/51
prob of third being picture card =10/50
answer =12/52x11/51x10/50=1320/132600=11/1105

Assuming no replacement.

if they are repaced each time it is 12/52x12/52x12/52=27/2197

will try and put up some  of the notes youwant tonight.

[sonali]

srry bt d ans still does not tally
d ans according to d book is 0.010(3dp)

[astarmathsandphysics]

yes 11/1105

[shivluvchem]

f(x)= 10^x

A)f-1(1)*inverse*=??
Astarmathphy plz help!!
Im stuck!

[astarmathsandphysics]

inverse =log10x

[shivluvchem]

wats this??
We dunt have log in our sylabus!
The ans is 0!But hoW?

[astarmathsandphysics]

Sorry I am learning the syntax on the forum, The inverse to an exponential is a log. Every log has a base. If f(x)=4^x the base is 4. In this case the base is 10.

[astarmathsandphysics]

I understan. What you have is like a double inverse. You end up with the value you started with ie f-1-1(x)=x In this case x=1 so log10x=1

[shivluvchem]

No its a single inverse! That was to explain to u tht it was  an inverse!
So wats the solution?

[astarmathsandphysics]

f-1 is inverse
and inverse is inverse

[shivluvchem]

wait lets get this strait!
Just let me noe as to how i can obtain an ans as 0!
THe question is on top!
Q. f(x)= 10^x
Q. F(inverse of 1)=?

[astarmathsandphysics]

inverse of 10^x is log10x

10^0=1
and log101=0