Question

What is the 200th odd number

Answer 1

1st one . . . . . 1
2nd one . . . . . 3
3rd one . . . . . 5
4th one . . . . . 7
5th one . . . . . 9
.
.
9th one . . . . . 17

It looks to me like the 'n'th odd number is always  (2n - 1) .

In that case, the 200th odd number is  (2x200 - 1)  =  399 .

I'll let you check it out and see if that's correct.