Question

some fishermen caught some fish. No one caught more than 20 fish.a1 number of fishermen caught at least one fish among them, a2 number of fishermen caught at least two fish among them, and so on and a20 number of fishermen caught exactly 20 fish among them.How many fish were caught?
1.) a1+a2+a3+....+a20
2.)a1+2a2+3a3+.......+20a20
3.)20(a1+a2+a3+.......+a20)
4.)20(a1+2a2+3a3+........20a20)

suggest me a best answer guys!!!!!!

Answer 1

option 2 is the answer

Answer 2

option 1 is the right answer