If xyz = 1, x + \(\frac{1}{y}\) = 5, y + \(\frac{1}{x}\) = 29 find (z + \(\frac{1}{y}\))
Answer & explanation
Correct answer: option 2
Note the result:
if x + \(\frac{1}{y}\) = m
y + \(\frac{1}{z}\) = n
z + \(\frac{1}{x}\) = p
then (m×n×p) - (m+n+p) = xyz + \(\frac{1}{xyz}\)
So,
ATQ,
m = 5 and n = 29, xyz = 1, put these values in result:
(5 × 29 × p) - (5 + 29 + p) = xyz + \(\frac{1}{xyz}\)
145 p - (34 + p) = xyz + \(\frac{1}{xyz}\)
145 p - 34 - p = 1+1
145 p - p = 36
p (145 - 1) = 36
p = \(\frac{36}{144}\)
p = \(\frac{1}{4}\)