CDS Government Jobs Exams

What is the probability for a family with three children to have a boy and two girls (assuming the probability of having a boy or a girl is equal)?

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cases are- bbb, bbg, bgb, bgg, gbb, gbg, gbb, ggg total =8
fav.= 3 i.e. bgg, gbg, ggb
prob.=3/8
12 years agoHelpfull: Yes(4) No(1)

Total possible combinations = 8
Favourable combinations are BGG,GBG,GGB.

so probability = 3/8
12 years agoHelpfull: Yes(2) No(1)

CDS Other Question

A man saves 20% of his income. If his expanses be increased by 35%, By what % his income to be raised so that he can save 10% of his income. two trains each 100m long moving in opposite directions , cross each other in 8 seconds. if one is moving twice as fast the other then the speed of the faster train is:

1) 30 kmph
2) 45 kmph
3) 60 kmph
4) 75 kmph