Solve for N $56 ^ { . }~ {}_{ n - 1} P _ { 6 } = { } _ { n + 1 } P _ { 7 }$

Multiple Choice

Solve for n.? $56 ^ { . }~ {}_{ n - 1} P _ { 6 } = { } _ { n + 1 } P _ { 7 }$

A) no solution
B) ?n = 7
C) ?n = 7,48
D) ?n = 8,47
E) ?n = 48