hello can you please help me posted picture of question

Total number of fish in the tank = 40
Number of goldfish in the tank = 18

Probability of picking a goldfish = 18/40
After picking first fish,we have 17 goldfish in the tank and total fish now are 39.

So, probability of picking the second goldfish = 17/39

The probability of picking two goldfish = 18/40 x 17/39 = 51/260

Thus, option C gives the correct answer