It is this question that makes countless Google interviewers bow to their knees! Ask the master to explain.

One condition is missing. The age sequence is a, b, c, d, e, f and g, which decreases in turn.

1. According to condition 6, F is a woman, and G is not bigger than F, otherwise G has sisters, and G cannot be a woman, otherwise F has sisters. So there are:

F (female) > G (male), and F is the youngest girl;

2. According to the condition 1, A has three sisters, and according to the condition 3, C has two sisters, so C must be smaller than A, otherwise C must have more than three sisters, so A>C (female), and C is the oldest of A sisters;

3. according to condition 6, c cannot be less than f, otherwise c is f's sister, so f is c's sister, that is, c (female) >; F (female), and there is a girl between C and F.

4. If E is greater than A, according to Condition 5, there are at least 3 people who are greater than A; According to the conclusion of step 1, there are three sisters younger than A and four people in G, so the total number is at least eight, and now there are only seven people, which is contradictory. So e is smaller than a, and e has two sisters, so e is bigger than F.

The relationship so far is: A>c (female) > E> female > male.

There are many possibilities, all of which meet six conditions:

1) If A, C, E and F are all women, just press D > for D and B; B& gt； The order of g can be satisfied arbitrarily, for example

A (female) > C (female) > E (female) > F (female) > D (male) >; B (male) > g (male)

Or:

D (male) >; A (female) > C (female) > E (female) > F (female) > B (male) > G (male)

There are many other combinations;

2) If A is male and E is male, then yes.

A (male) > B (male) > C (female) > D (female) > E (male) > F (female) > G (male)

A (male) > C (female) > B (male) > D (female) > E (male) > F (female) > G (male)

It is also a lot of situations.

Others can also be analyzed similarly. Without the condition of age order, this problem cannot be judged.