# what is 100 factorial?

what is 100 factorial | What is the factorial of 100 | What is the meaning of 100 factorial | How many zeros are in 100 factorials

## 100 factorial

The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. In the case of 100, 100! (100 factorial) can be calculated as:

100! = 100 × 99 × 98 × … × 2 × 1

Using a calculator or a programming language with support for large numbers, we can evaluate this expression to get:

100! = 9,332,621,544,394,415,268,163,296,266,242,508,740,540,755,917,897,812,643,303,316,762,930,711,981,276,706,728,268,716,938,837,743,563,074,325,856,957,331,761,821,540,894,879,722,427,592,568,271, 4,179,231,889,693,479,991,042,367,714,105,736,666,539,542,646,206,104,772,448,467,492,168,869,803,224,274,622,111,496, 796,249,481,641,953,868,218,774,760,853,271,322,857,231,104,248,034,318,588,780,245,953,426, 198,350,553,849,623,029,724,399,172,277,362,795,000,568,127,145,263,560,827,785,771,342,757, 789,609,173,637,178,721,468,440,901,224,953,430,146,549,585,371,050,792,279,689,258,923, 541,962,516,230,624,043,621,475,322,957,641,135,616,214,135,353,036,956,736,256,987,361, 977,246,830,345,347,912,879,678,071,440,300,000,000,000,000,000,000,000,000,000,000,000.

Therefore, 100! is a very large number, with 158 digits.

## What is 100 factorial?

`9.332622e+157`

## What is the meaning of factorial?

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! (read as “five factorial”) is equal to 5 × 4 × 3 × 2 × 1, which evaluates to 120.

Factorials are used in various mathematical calculations, including probability theory, combinatorics, and calculus. In combinatorics, the factorial function is used to calculate the number of ways in which a set of distinct objects can be arranged in a sequence. For example, if you have 4 distinct objects and you want to arrange them in a row, there are 4! = 24 possible arrangements.

The factorial function grows very quickly as n gets larger. For example, 100! is an extremely large number with 158 digits. The factorial function is defined only for non-negative integers, and the factorial of 0 is defined to be 1.

## How many zeros are in 100 factorial?

To find the number of zeros at the end of 100 factorial, we need to count the number of factors of 5 in the product of 100!, since each factor of 5 contributes one zero at the end of the product. This is because a zero is created when we multiply a factor of 10, which can be expressed as 2 × 5.

Since the factor of 5 appears less frequently than the factor of 2 in the product of 100!, we only need to count the number of factors of 5. It is easy to see that there are 20 factors of 5 in the numbers from 1 to 100 (5, 10, 15, …, 95, 100), and each factor of 25 contributes an additional factor of 5. There are 4 factors of 25 in the numbers from 1 to 100 (25, 50, 75, 100).

Therefore, the total number of factors of 5 in 100! is 20 + 4 = 24, which means that there are 24 zeros at the end of 100!.

## Sum of 100 factorial

The sum of digits in 100 factorial, denoted by S(100!), is the sum of all the digits in the number 100!. This can be a difficult calculation to perform manually since 100! has 158 digits. However, we can use a simple algorithm to estimate the value of S(100!).

First, note that each digit in the number 100! can be at most 9, since each factor in the product is a positive integer less than or equal to 100. Therefore, the sum of the digits in 100! is less than or equal to 9 times the number of digits in 100!, which is 9 × 158 = 1,422.

Next, we can use the fact that the sum of the digits in a number is congruent to the number modulo 9. This means that if we divide the sum of the digits in 100! by 9, the remainder will be the same as the remainder when we divide 100! by 9.

It is well-known that 100! is divisible by 9 (since it is divisible by 3, and the sum of its digits is divisible by 3), so the remainder when 100! is divided by 9 is 0. Therefore, the remainder when S(100!) is divided by 9 is also 0.

Using these facts, we can conclude that the sum of the digits in 100 factorial is a multiple of 9. However, this method does not give us an exact value for S(100!). To find the exact value, we would need to use a more sophisticated algorithm or a computer program.

9.332622e+157

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