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    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s13_qp_62.pdf May I please request anyone to help me with Q4 in the above paper. I can do the first part, and also find n, but don't know how to find k. Thank you in advance. God bless.
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