Question

please anybody send me the solution

Answer 1

1.=132/144=11/12
2 probability of one bulb defective =4/20=1/5
Probability after taking out one fine bulb=15/19

Answer 2

8.
the defective pen ==12

good pens ==132

total pens = 132+12 =144

then
the probability of pen good one is = 132/144
= 11/12 answer




9.
TOTAL BULB =20
DEFECTIVE BULB = 4

GOOD BULB = 20-4= 16

THEN
the probabilty of bulb is defective = 4/20
=1/5

now according to question
we select one defective bulb but its not defective
and we cannot count this this bulb again
then
the total bilb = 19
defective = 4
good bulb = 19-4= 15


then
the probability of good bulb = 15/19








HOPE ITS HELP YOU DEAR