Jack invests 1,000 at the end of each year for n years at an effective interest rate of i. At the end of n years, it has accumulated to X.
Jill invests 2,000 at the end of each year for 2n years at an effective interest rate of i. At the end of 2n years, it has accumulated to 6X.
Junior invests 3,000 at the end of each year for 3n years at an effective interest rate of i. At the end of 3n years, it has accumulated to Y.
i > 0. Calculate Y.
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