- #1

member 141513

## Homework Statement

suppose we have two particles, first with probable states A1,A2,A3 and state B1,B2,B3 each with a certain probability P

Now if we know the probability of composite state |C> is Q

what is the probability to get the first particle to be A1?

im troubled. please help thanks

Here ,probability of getting C is any linear combination of A and B = aP(A)+bP(B)

## Homework Equations

## The Attempt at a Solution

i have tried to do like this

because C equals one of these 9 states (A1,A2,A3)+(B1,B2,B3)

lets call them |1>,|2>,...,|9>

i don't know how to relate use the "resultant" prbability to get back the original component probability

is it correct to use, for example <C|1> in calculation, I am in trouble