We look at the division of 79902120 by 331 
The aim is to understand the frequency of 331 in 79902120.

Let's proceed to step 1:
331 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 331

Advancing to step 2:
The number 331 fits into 79 0 times, leaving a remainder of 79.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 79 after subtracting 0 from 79.
Fetch the next digit (9) from the dividend, attach it to 79 and continue: 799 / 331

Let's proceed to step 3:
331 can be fit into 799 2 times, resulting in a remainder of 137.
The next digit of our result is 2. 
Result so far: 2.0
If we take 662 away from 799, we end up with 137.
Take the next digit (0) from the dividend and append it to 137, then repeat: 1370 / 331

Let's proceed to step 4:
If we divide 1370 by 331, we get 4 and a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Deduct 1324 from 1370 and we're left with 46.
Append the next digit (2) from the dividend to 46 and continue with: 462 / 331

On to step 5:
331 goes into 462 1 times with a remainder of 131.
Use 1 as the next digit of our solution. 
Result so far: 241.0
If we take 331 away from 462, we end up with 131.
Grab the next digit (1) from the dividend, add it to 131, then carry on: 1311 / 331

On to step 6:
When dividing 1311 by 331, we get 3 with a remainder of 318.
The number 3 becomes the next digit in our result. 
Result so far: 2413.0
If we subtract 993 from 1311, we get 318.
Append the next digit (2) from the dividend to 318 and continue with: 3182 / 331

Moving on to step 7:
If we divide 3182 by 331, we get 9 and a remainder of 203.
Record the quotient 9 as the next digit in the result. 
Result so far: 24139.0
If we subtract 2979 from 3182, we get 203.
Bring next digit (0) of the dividend behind the 203 and repeat the process: 2030 / 331

Let's proceed to step 8:
When dividing 2030 by 331, we get 6 with a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 241396.0
The remainder is 44 after subtracting 1986 from 2030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 9:
The number 331 fits into 440 1 times, leaving a remainder of 109.
Put 1 as the next digit of the answer. 
Result so far: 241396.1
Subtract 331 from 440 to get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Going ahead to step 10:
The number 331 fits into 1090 3 times, leaving a remainder of 97.
Put 3 as the next digit of the answer. 
Result so far: 241396.13
The remainder is 97 after subtracting 993 from 1090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Step 11:
331 goes into 970 2 times with a remainder of 308.
Put 2 as the next digit of the answer. 
Result so far: 241396.132
Deduct 662 from 970 and we're left with 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Advancing to step 12:
When dividing 3080 by 331, we get 9 with a remainder of 101.
The number 9 becomes the next digit in our result. 
Result so far: 241396.1329
The remainder is 101 after subtracting 2979 from 3080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Going ahead to step 13:
If we divide 1010 by 331, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 241396.13293
Subtract 993 from 1010 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 14:
331 goes into 170 0 times with a remainder of 170.
Use 0 as the next digit of our solution. 
Result so far: 241396.13293
If we subtract 0 from 170, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 15:
331 can be fit into 1700 5 times, resulting in a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 241396.1329305
Subtracting 1655 from 1700 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 16:
When dividing 450 by 331, we get 1 with a remainder of 119.
Record the quotient 1 as the next digit in the result. 
Result so far: 241396.13293051
Deduct 331 from 450 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Our division results in 241396.13293051 with a remaining 1.19e-07.