Exp. (a)S={00,01,02,…,49}Let A be the event that sum of the digits on the selected ticket is 8 , thenA={08,17,26,35,44}Let B be the event that the product of the digits is zero.B={00,01,02,03,…,09,10,20,30,40}∴A∩B={8}∴ Required probability =P(BA​)=P(B)P(A∩B)​=5014​501​​=141​