The first odd number is 1, the second odd number is 3, the third odd number is 5 and so on. The 200th odd number is

First odd number = 1
Second odd number = 3
Third odd number = 5
 n th odd number
= 1 + (n – 1) 2 = 2n – 1
 200th odd number
= 2 × 200 – 1= 400 – 1 = 399

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