{1/log_(p/q)x} + {1/log_(q/r)x} + {1/log_(r/p)x} এর মান কত?

প্রশ্ন: {1/log_(p/q)x} + {1/log_(q/r)x} + {1/log_(r/p)x} এর মান কত?

সমাধান:
{1/log_(p/q)x} + {1/log_(q/r)x} + {1/log_(r/p)x
= log_x(p/q) + log_x(q/r) + log_x(r/p)
= log_x{(p/q) × (q/r) × (r/p)}
= log_x1
= 0