If a1,a2,a3,…a_1, a_2, a_3, \dotsa1,a2,a3,… is an arithmetic progression, and am=1n,an=1ma_m = \frac{1}{n}, a_n = \frac{1}{m}am=n1,an=m1, what is the value of amna_{mn}amn?
111
1mn\frac{1}{mn}mn1
m+nmn\frac{m+n}{mn}mnm+n
000