If-x-y-1-then-r-0-n-r-n-C-r-x-r-y-n-r-equals- Tinku Tara June 14, 2023 None 0 Comments FacebookTweetPin Question Number 63943 by gunawan last updated on 11/Jul/19 Ifx+y=1,then∑nr=0rnCrxryn−requals Commented by mathmax by abdo last updated on 11/Jul/19 x+y=1⇒(x+y)n=1⇒∑r=0nCnrxryn−r=1⇒yn+∑r=1nCnrxryn−r=1letderivate(yfixed)⇒∑r=1nCnrrxr−1yn−r=0⇒1x∑r=1nCnrxryn−r=0(x≠0)⇒∑r=0nCnrxryn−r−yn=0⇒∑r=0nCnrxryn−r=ynifx=0⇒y=1and∑r=0n(…)=0 Answered by mr W last updated on 11/Jul/19 (x+y)n=1∑nr=0Crnxryn−r=1∑nr=0rCrnxr−1yn−r=0∑nr=0rCrnxryn−r=0×x⇒∑nr=0rCrnxryn−r=0 Terms of Service Privacy Policy Contact: info@tinkutara.com FacebookTweetPin Post navigation Previous Previous post: Let-1-x-n-r-0-n-C-r-x-r-and-r-0-n-C-r-r-1-k-then-the-value-of-k-is-Next Next post: 0-pi-x-sin-x-1-cos-2-x-dx- Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Save my name, email, and website in this browser for the next time I comment.