Some n number of premises implies a conclusion means that, If all the n premises are true then conclusion is true as well.
p and (p→q)∨(p∧(r→q)) both premises will be true only for below truth value assignments
(p=T,r=F,q=T), (p=T,r=T,q=T), (p=T,r=F,q=F)
none of the above truth value assignments has r=T,q=F hence , If both the premises(p and (p→q)∨(p∧(r→q)) ) are true then (r→q) is true as well.( Note: (r→q) is false for only r=T,q=F truth value assignment)