I have a very important math question.... this is going to ba VERY HARD to explain, but bare with me. Ok here it is...

If i give u a sequence of 5 random numbers...
#1 = 5
#2 = 6
#3 = 10
#4 = 2
#5 = 20

And if you found the difference beween the numbers like this
#1 and #2 = D = 1
#3 and D = 9
#4 and D = 7
#5 and D = 13

Now, lets say... i only gave you the last number, total numbers there are in the sequence, and the last difference.. between #4 and #5. It would look like this.

#1 = ?
#2 = ?
#3 = ?
#4 = ?
#5 = 20

Then Differenece between #1 and #2 = x
Then Difference between x and #3 = x
Then Difference between x and #4 = x
Then Difference between x and #5 = 13

Would you be able to work backwards to find the missing numbers?

Is this even possible?

If not, how could you make this work. Maybe instead of finding the difference between the numbers, you could add them or something. But i need a formula, so i can work backwards to find the missing numbers.

PLEASE HELP!
Thank you very much!

If you dont exactly understand what i mean, please specify what further information you require.