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• 11-13-2018, 05:23 AM
Oops. Thank you for pointing out this error. Yes, you are right. The second question is easier than the first one, so this one should be the...
5 replies | 231 view(s)
• 11-13-2018, 04:08 AM
Sorry, but I have finally worked it out, so I do not need help any more. My working is as follows: The triangles ANP and AMO are actually...
5 replies | 231 view(s)
• 11-13-2018, 01:12 AM
Please see the attachment and have a look at the diagram for this question. This is a question to prove double angle formulae using the diagram of...
5 replies | 231 view(s)
• 10-18-2018, 05:48 AM
Thank you so much for your help. Un = n*n! = n*n(n-1)(n-2)(n-3)....3*2*1 = (n+1-1)n! = {(n+1)-1}*n! = (n+1)n! - n! = (n+1)! - n! So Sn =...
3 replies | 131 view(s)
• 10-18-2018, 12:28 AM
I have difficulty with the following question: The sequence of numbers {un} is defined by un=n*n!. 1) Let Sn= u1+u2+u3+...+un. Investigate Sn...
3 replies | 131 view(s)
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