Question

Write code in Python: explain with comments

Starting with two one-digit positive integers a and b, consider the sequence in which the next number is the digit in the ones place of the sum of the previous two numbers. For example, if a = 1 and b = 1, the sequence is 1, 1, 2, 3, 5, 8, 3, 1, 4, 5, 9, 4, 3, 7, 0, … Write a function mystery(a, b) that returns the length of the sequence when the last two numbers repeat the values of a and b for the first time. For example, if a = 1 and b = 1, the function should return 62.

Answer 1

`Hey,

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https://onlinegdb.com/S1SmBF-cS

def mystery(a,b):
f1=a;
f2=b;
ct=2;
while(True):
c=(a+b)%10;
a=b;
b=c;
ct+=1;
if(f1==a and f2==b):
return ct;
print(mystery(1,1));

Kindly revert for any queries

Thanks.