nomer 2 itu gimana ya

S = 210
n (berjumlah genap) : { (2,2) (2,4) (2,6) (2,8) (2,10) (2,12) (2,14) (2,16) (2,18) (2,20) (4,4) (4,6) (4,8) (4,10) (4,12) (4,14) (4,16) (4,18) (4,20) (6,6) (6,8) (6,10) (6,12) (6,14) (6,16) (6,18) (6,20) (8,8) (8,10) (8,12) (8,14) (8,16) (8,18) (8,20) (10,10) (10,12) (10,14 (10,16) (10,18) (10,20) (12,12) (12,14) (12,16) (12,18) (12,20) (14,14) (14,16) (14,18) (14,20) (16,16) (16,18) (16,20) (18,18) (18,20) (20,20)}

Peluang = n/ n(S)
= 55/210
= 11/42
Jadi jawabannya 11 per 42