We look at the division of 77408975 by 1 
The aim is to understand the frequency of 1 in 77408975.

Moving on to step 1:
When dividing 7 by 1, we get 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 7 from 7 leaves us with 0.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 1

On to step 2:
The number 1 fits into 7 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 77.0
The remainder is 0 after subtracting 7 from 7.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 1

Step 3:
When dividing 4 by 1, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 774.0
If we take 4 away from 4, we end up with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 1

Step 4:
0 divided by 1 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 7740.0
Deduct 0 from 0 and we're left with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 1

Going ahead to step 5:
The number 1 fits into 8 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 77408.0
If we subtract 8 from 8, we get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 1

Step 6:
If we divide 9 by 1, we get 9 and a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 774089.0
If we subtract 9 from 9, we get 0.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 1

Moving on to step 7:
7 divided by 1 is 7 with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 7740897.0
If we subtract 7 from 7, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 1

Moving on to step 8:
If we divide 5 by 1, we get 5 and a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 77408975.0
Subtracting 5 from 5 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
1 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 77408975.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 77408975.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 77408975.0 with a remainder of 0.0.