If two caps are picked at random, what is the probability

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A box contains 2 blue caps, 4 red caps, 5 green caps and 1 yellow cap.

If two caps are picked at random, what is the probability that atleast one is red ?

1. 1/3
2. 16/21
3. 19/33
4. 7/19

Correct Option: C

Required probability = 1 - ⁸C₂/ ¹²C₂
= 1 - 28/66 = 38/66 = 19/33