1.

am - aAnTo foto ye, —t given)(given)am n = 1

Answer»

am=1/na+(m-1)d=1/n--------(1)

an=1/ma+(n-1)d=1/m---------(2)

(1)-(2)(m-n)d=1/n - 1/md=1/mn

put in eq(1)a+(m-1)/mn=1/na=1/n - (m-1)/mna=1/mn

amn=a+(mn-1)damn=1/mn+(mn-1)/mnamn=1



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