A jar contains 2 black marbles and 1 red marble. Lisa randomly selects one marble, notes its color and then places it back in the jar. Then, she selects a marble from the jar again. What is the probability that she selected a black marble at least once?
A. 4/9
B. 1/2
C. 3/4
D. 8/9

Answer :

the Answer is. (( B ))

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

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