Terms & Conditions
...what is the day after the day before the day before tomorrow?
Hint: Think carefully.
I have two children. At least one of them is a boy.
What is the probability that both my children are boys?
My sister also has two children. The older child is a girl.
What is the probability that both her children are girls?
Hint: Before we're told anything, there are four possible combinations.
If we list the possible combinations before we're told anything, and listing the eldest child first we have 4 possible outcomes:
Since I have two children, and we know that at least one is a boy, there are three equally probable cases: Boy-Boy, Boy-Girl or Girl-Boy. In only one case are both children boys, so the probability that both are boys is 1 in 3.
My sister's situation is different. Knowing that the older child is a girl, there are only two equally probable cases: Girl-Girl or Girl-Boy. Therefore the probability that both children are girls is 1 in 2.
What letter comes next in this sequence:
M A M J J ==?==
Hint: There are 12 items in the complete list.
The sequence is March, April, May, June, July, August.
Are there more centimetres in a mile or miles travelled by light in a second?
Light travels over 186,000 miles per second and there are 160,934.4 centimetres in a mile.