एक एकल निरंतर श्रृंखला प्राप्त करने के लिए सूचकांकों की दो या दो से अधिक अतिव्यापी (overlapping) श्रृंखलाओं को संयोजित करने की प्रणाली को क्या कहा जाता है?

Fisher's ideal index number is calculated as the geometric mean of which two index numbers?

Given below are two statements: Assertion (A): Geometric Mean is theoretically considered the best average for constructing Index Numbers. Reason (R): Geometric Mean is suitable when observations are expressed as relative values, ratios, or percentage changes. In light of the above statements, choose the correct option: