5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6
How many odd numbers are there in the sequence which is immediately followed by an odd number?
1
5
3
More than 4
2
Numbers in which next digit is an odd number are 51, 73, 57, 31, 39, 15.