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The rth term in the 19th row is 19Cr = 19!/[r!*(19-r)!] where k! = 1*2*3*...*k
The three numbers are pairwise coprime so the answer is any number of the form k*11*15*19 where k is an integer.
k^2 + k = k^2 + k k^2 x k = k^3
It could be, if it is a regular stick arrow then no.
72 - k = 31 Therefore, k = 72 - 31 k = 41