This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The 1st sequence is 1 3 5
which has a difference of 2

The 2nd sequence is 2 4 ?
which is in the multiples of 2
hence, it will be 8.
This represents a gear system. And the answer is 'R'
1 5 1