because
n+ 1 & gt; n- 1
The larger the denominator, the smaller the fractional value, so
M & gtP
p-N = N/(N+ 1)-(N- 1)/N
=[n^2-(n- 1)(n+ 1)]/n(n+ 1)
= 1/n(n+ 1)>0
therefore
P> ordinary
M>P> noun (abbreviation of noun)