1 votes 1 votes adarsh shivhare asked Dec 31, 2017 adarsh shivhare 1.1k views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply gauravkc commented Dec 31, 2017 i edited by gauravkc Dec 31, 2017 reply Follow Share For n and m to be coprime, there should not be any common factor between n and m, 91 = 13 * 7 Hence, multiples of 13 and 7 will have common factors with 91. 13 * 6 = 78 < 91 . So 6 numbers 13,26,39.. will be excluded 7 * 12 = 84 < 91 . So 12 numbers will be excluded. LCM of 13 and 7 is 91. Hence no common number between both. from 91, 91 - 1 (1 is not relatively coprime) - 12 - 6 = 72 1 votes 1 votes LeenSharma commented Dec 31, 2017 reply Follow Share 72 numbers 1 votes 1 votes gauravkc commented Dec 31, 2017 reply Follow Share Oops. Less than 91. So 91 won't be included 0 votes 0 votes Please log in or register to add a comment.
