Find the eccentricity of 4/ (-2 - 6sin(theta))

a) 2

b) -2

c) 3

d) -3

20 marbles in all of which: 5 are blue, 5 are red, 5 are white and 5 are black

Drawing 2 marbles without replacing the 1st blue drawn

P(2 blue) = 5/20*4/19 = 20/380 = 1/19

Drawing 2 marbles with replacement of the first blue one

P(2 blue) = 5/20*5/20 = 25/400 = 1//16

1/16 > 1/19