If x, y, z are in HP, then log (x + z) + log (x- 2y + z) is equal to
log (x-z)
2 log (x-z)
3 log (x-z)
4 log (x-z)
As we learn
General term of HP
where
here and
y =
log (x + z) + log (x- 2y + z)
= log (x + z) . (x- 2y + z)
= log [(x + z)2- 2y (x + z)]
= log
= log [(x + z)2- 4xz] = log (x-z)2 = 2log (x-z)
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