hey ......look............
this is a general formula................
and if function satisfies......................
f(x) .f(1/x)= f(x)+f(1/x).
then
f(x)= xn + 1 or xn-1
okkkkk.......
here f(12)=1729 ......means
12n +1 = 1729......
12n =1728
therefore...... n= 3.........
therefore........f(x)= x3+ 1
for f(10) = 103 +1
= 1001......(ans)
thus option b is correct........
thankuuuuuuuu
hope u have understood.......
Moderation Team
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