@potterhead
there are 7 places for P,S viz
(1,6)
(2,7)
....(7,12)
now left 10 letters in ten places, of which two are repeated.
also p, s can swap their places.
so 7 * 2 * 10!/2!

@potterhead limlimlim x-->0 (log(1+x3)/x3)(x2/2sin2x)(x/c2(log(1+x^3)/x^3)(x^2/2sin^2x)(x/c^2(log(1+x3)/x3)(x2/2sin2x)(x/c2x^xx−^-−1)^1)1)
now apply limit
first bracket gives 1
second gives 1/2
third gives 0
so answer is 0