N(-d1)Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA AFM Exams › N(-d1)This topic has 1 reply, 2 voices, and was last updated 9 years ago by John Moffat.Viewing 2 posts - 1 through 2 (of 2 total)AuthorPosts May 29, 2015 at 11:46 am #250175 flexiMemberTopics: 12Replies: 27☆Sir what is the relationship between N(d1) and N(-d1)?I ask because in Marengo Dec 2010,they have asked you to assume delta is N(-d1)When I use the Black scholes formula I find d1 = -0.0552 use the distribution table and SUBTRACT 0.5 from my distritubution table answer.However I see the answer that what they did wasd1=-0.0552 And then -d1= 0.0552 (Note the sign change) And because of this they now ADD the 0.5 from the distribution table..Why have they swapped the negative sign around..this is crucial because it determines wether to add or subtract that 0.5 distribution table answer. May 29, 2015 at 12:27 pm #250195 John MoffatKeymasterTopics: 57Replies: 54628☆☆☆☆☆D1 = – 0.0552So….- D1 = – – 0.0552 = + 0.0552(two minus’s become a plus )AuthorPostsViewing 2 posts - 1 through 2 (of 2 total)You must be logged in to reply to this topic.Log In Username: Password: Keep me signed in Log In