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26 . n!/ (n-2)! = 15. (n+3)! / (n+3- 2)!
26. n(n-1) = 15. (n+3)! / (n+1)!
26. n(n-1) = 15. (n+3)(n+2)
26n² - 26n = 15(n²+5n+6)
26n² - 26n = 15n² + 75n + 90
(26-15) n² + (-26-75)n +(-90) = 0
11n² - 101 x - 90 = 0
(11n + 9)(n - 10) = 0
n = -9/11 (Tidak memenuhi)
n = 10