Chapter 109

Shen Shaobai is busy?

Only love to listen, a little curiosity under the heart, he can't see, what else can he be busy with.

Although I think so, I nodded, "OK, I'll pay attention."

After that, pick up sister gently open the door, let love in.

In the room, it is rare for the light to be bright, reflecting the surroundings as if in the daytime.

Face to face, only love to guess, here should be the study.

Just because, the front is the bookshelf, on the bookshelf lay a row of books, neatly placed there Next to the bookshelf, there is a desk. The man is sitting there with his legs folded. He has a headset on his ear.

From his mouth, he speaks every sentence fluently, like English or French.

Only love to admit that they are really learning slag, do not understand!

Even though Shen Shaobai is in a busy time, he still notices that only love and long fingers are stretched out Love to follow a look, from the edge of the desk, there is also a desk, which is stacked with many books.

Depending on him not to see, only likes to put out a tongue, makes a grimace, but still walks forward.

"This is..."

When I came near and saw the books, I was a little surprised.

How can there be textbooks here? It's still college!

Only love is a little confused, but I thought that not long ago, I left my words at home and said that I would pass Meng Kexin's exam Immediately sit down, grasp a minute and a second, take the top math book, open to review.

College mathematics is just a bunch of numbers. It's like a celestial book. It knows you, you don't know it Only love can't say, can't understand at all, but it's really difficult. We have to force ourselves to aim at the above question.

If you don't understand the first time, read the second time and the third time She can't solve the problem if she doesn't believe it!

Only love, while believing in it, unconsciously read aloud: "there are 3 black balls, 2 red balls and 2 white balls in the box. Take any 4 balls, X for the number of black balls, y for the number of red balls, and calculate the joint distribution rate of X and y..."

Read it many times in a row, only love the first two big, and finally can't help throwing a pen: "depend on! What's the problem?! "

"I didn't say, girls don't swear."

Suddenly, a voice sounded, obviously close at hand.

But love followed with a shudder, raised his head, ran into Shen Shaobai's deep eyes and said angrily, "master Shen, people scare people and frighten people. Don't you know such a simple truth?"

Hua Dun, focus on the topic again, put his arms on the table: "can you wait? I'm busy... "

"Ah..."

He smiled lightly, with a thin sneer.

Then, he took out a piece of paper with a long finger, picked up the pen which was thrown down by love only, and continued to talk:

"for example, the probability of x = 0, y = 0 is 0, x = 0, y = 2 is 1C (7, 4) = 135, where C (7, 4) is the combination number of any four of the seven, similarly, the probability of x = 2, y = 2 is C (3, 2) C (2, 2) C (7, 4) = 335 So, the joint distribution rate of X and Y is x = 0, x = 1, x = 2, x = 3 Y=0，0，0，335，235…… Y=1，0，635，1235，235…… Y=2，135，635，335，0。”

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