if Tn =1/m and Tm=1/n, find a and d
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tn=1/m
tm=1/n
a+(n-1)d=t
a+(n-1)d=tn
a+(n-1)d=1/m....1
a+(m-1)d=tm
a+(m-1)d=1/n....2
Now on subtracting the two equations...
(n-1)d-(m-1)d=1/n-1/m
nd-d-dm+d=(m-n)/mn
nd-dm=(m-n)/mn
-d(-n+m)=(m-n) /mn
mn*-d=(m-n) /(m-n)
mn*-d=1
-d=1/mn
d=-1/mn...
Calculate a by substituting this value
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