0 votes 0 votes A man takes a step forward with probability 0.4 and backwards with probability 0.6 .find the probability that at the end of eleven steps he is just one step away from the starting point Shashank Kumar Mishr asked Mar 14, 2017 recategorized Mar 14, 2017 by Pavan Kumar Munnam Shashank Kumar Mishr 911 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
2 votes 2 votes 6 forward 5 backward or 6 backward 5 forward 11C6 * (0.4)^6 * (0.5)^5 + 11C6 * (0.4)^5 * (0.6)^5 11C5 * (0.4)^5 * (0.6)^5 * (0.4 + 0.6) = 0.368 is the answer Pavan Kumar Munnam answered Mar 14, 2017 Pavan Kumar Munnam comment Share Follow See all 4 Comments See all 4 4 Comments reply Shashank Kumar Mishr commented Mar 14, 2017 reply Follow Share understood thanks 0 votes 0 votes Akriti sood commented Mar 14, 2017 reply Follow Share why are u using binomial here? cant we just do like this -(0.4)6 * (0.6)5 + (0.4)5 + (0.6)6 pls correct me. 0 votes 0 votes 2018 commented Mar 14, 2017 reply Follow Share he is just one step away from the starting point no, u have to choose 6 forward step and 5 backward step in any combination like that for 2nd part. $(0.4)^{6} * (0.6)^{5}$ this means u r choosing only one combination that is 1st taking all 6th forward step after that 5 backward step, valid but it is only one of the combination among $^{_{6}^{11}\textrm{C}}$ 0 votes 0 votes Akriti sood commented Mar 15, 2017 reply Follow Share oo yes..i missed that.thanks :) 0 votes 0 votes Please log in or register to add a comment.