If you mean: n-4 = 10 then n =14
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(n/(18*6))/n4=(n/108)/n4 ;Multiply 18 and 6(n/108)*(1/n4) ;Multiply by the reciprocal of n4, which is just 1 over n4n/(n4*108) ;The n4 will go in the bottom of the fraction1/(108n3) ;n over n4 will give you 1 over n3
It could be 37. Use Un = (n4 - 6n3 + 18n2 - 18n + 168)/24 with n = 6
4n or n4
The next number would be 7 * * * * * An assertion with no rationale or justification. I suggest 10, with the following rationale: fit the sequence t(n) = (n4 - 18n3 + 131n2 - 474n + 760)/4 for n = 1, 2, 3, ...
The product of four and a number would be algebraically written as 4n, or whatever variable equals the number. In this case, n = number. It would not be written n4, nx4, 4xn, 4*n or n*4, although n4 and the ones with stars may be accepted by a teacher.