1 votes 1 votes Why not 2, why 3 , for example if we take { 1,3} from { 1,3,5,7,9} or {2,4} from { 2,4 ,6 ,8} still with two numbers we can get sum as even..Kindly help thanks :) Combinatory combinatory discrete-mathematics + – Pawan Kumar 2 asked Jan 22, 2018 Pawan Kumar 2 313 views answer comment Share Follow See all 4 Comments See all 4 4 Comments reply Higgs commented Jan 22, 2018 reply Follow Share I think they wanted to ask: " .................... . Sum of the any two of the n integers selected is always even." Can you figure it now why its 3 and not 2? 0 votes 0 votes Pawan Kumar 2 commented Jan 22, 2018 reply Follow Share Still If I say i must select either two odd numbers or two even numbers. so again two are selected minimum 0 votes 0 votes Higgs commented Jan 22, 2018 reply Follow Share what if we get {even, odd} ?? 1 votes 1 votes Pawan Kumar 2 commented Jan 22, 2018 reply Follow Share yeah I was missing that every case is to be considered ... Thanks :) 1 votes 1 votes Please log in or register to add a comment.