self Maths Puzzle

A man & his wife appear in an interview for 2 vacancies in the same post.The probability of husband's selection is (1/7) & probability of wife's selection is (1/5). what is the probability that only one of them is selected?
a)4/5
b)2/7
c)8/15
d)4/7
e)2/5
f)8/12
g)1/3
h)1/2

Read Solution (Total 6)

(6/7)*(1/5)+(1/7)*(4/5) = (6/35)+(4/35)= 10/35 = 2/7
15 years agoHelpfull: Yes(8) No(2)

b.2/7
15 years agoHelpfull: Yes(3) No(1)
2/7
14 years agoHelpfull: Yes(3) No(1)
2/7
15 years agoHelpfull: Yes(2) No(1)
ans b option
15 years agoHelpfull: Yes(2) No(1)
1/7 as there are 2 vacancies.
15 years agoHelpfull: Yes(1) No(3)

self Other Question

At a game of billiards, A can give B 15 points in 60 & A can give C 20 points in 60. How many points can B give C in a game of 90?
a)30 points
b)20 points
c)10 points
d)5 points
e)0 points
f)25 points
g)14 points
h)Data insufficient A shop sells 1 chocolate at the rate Rupee 1 each . You can exchange three warppers for one chocolate.
If you have Rs. 15, what is the maximum number of chocolates you can get?