A = {2, 3, 4, 5}
b = {4, 5, 6, 7, 8}
Two integers will be randomly selected from the sets above, one from set A and one from set B. What is the prob that the sum of two integers will equal 9 ?
A 0.15
B 0.20
C 0.25
d 0.30
E 0.33
ANS B
am getting B
my approach
total possible sets of two no. = 4X5= 20
totals sets when sum is 9 = (2,7) (3,6) (4,5)
prob = 3/20
= 0.15
pls point out my mistake
b = {4, 5, 6, 7, 8}
Two integers will be randomly selected from the sets above, one from set A and one from set B. What is the prob that the sum of two integers will equal 9 ?
A 0.15
B 0.20
C 0.25
d 0.30
E 0.33
ANS B
am getting B
my approach
total possible sets of two no. = 4X5= 20
totals sets when sum is 9 = (2,7) (3,6) (4,5)
prob = 3/20
= 0.15
pls point out my mistake
