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How many times is a penny after thirty days?
1, a penny a day, double the length of each day, then the next day is two cents, and so on;

2. If the principal is Y, it will be 1. 1Y one day later and1*1.1y =1.1the next day.

3. According to the calculation method of 2, the algorithm of thirty days' money is 1. 1 multiplied by y.

4, the result is 17.44940 times y, which is approximately equal to17.45 * y.

5, so, after 30 days, it is 17.45 times of the principal.

6. If the principal is a penny, the money after 30 days will be 17.45 cents.

Geometric series (1) refers to a series in which the ratio of each term to its previous term is equal to the same constant from the second term, usually expressed by G and P. This constant is called the common ratio of geometric series, usually expressed by the letter Q (q≠0) and geometric series a 1≠ 0. Where each item in {an} is not 0. Note: When q= 1, an is a constant series.

(2) According to historical legend, a Hindu king asked the prime minister what reward he needed. The Prime Minister said: Please put 1 wheat in the first box, 2 in the second box, 4 in the third box and 8 in the fourth box? In other words, the number of grains put into the back cell must be twice that of the front cell every time you place an order, until the 64th cell of the last cell is full, so I am very satisfied.

How many grains of wheat did the clever Prime Minister ask for? After a little calculation, we can get: 1+2+2 2+2 3+2 4+? +2 63 = 2 64- 1, and the number written directly is18,446,744,073,709,551,6 15. What the Prime Minister wants is actually the sum of the wheat produced in the world in 2000.

Personal learning financial management, a * * has three stages:

In the first stage, we should establish a scientific concept of financial management and learn basic financial management knowledge.

You need to learn financial knowledge in many ways, self-study or sign up for courses, and gradually improve yourself by learning the experience of financial experts. Through articles, books, courses, etc.

The second stage: establish your own investment strategy.

Financial management is inseparable from investment, but investment needs to pay attention to risks. Income and risk are in direct proportion, and low income and low risk depend on four elements: income, security, liquidity and threshold. Choose financial products that suit your risk preference and configure them.

The third stage: follow-up management, that is, asset allocation rebalancing.

The market is always changing, and the proportion of asset allocation we made at the beginning is also passively changing. We should always pay attention to it and make corresponding countermeasures in order to gain benefits in the rapidly changing market.

The above is my summary, I hope it can help you a little.