एक गुणोत्तर श्रेणी (GP) का 4था पद 81 है। यदि पहला पद 3 है, तो सार्व अनुपात (common ratio) क्या है?

The sum of 4 arithmetic means (AMs) inserted between 3 and 23 is:

If the 7th term and 12th term of an arithmetic progression are 34 and 59 respectively, then its 15th term is:

If two geometric means G1 and G2 are inserted between 3 and 75, then G2 is equal to: