When are resistors said to be connected in series ?

How resistors can be connected in different ways ?

An inductor of reactance 1 Omega and a resistor of 2 Omega are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is

First a set of n equal resistors of R each are connected in series to a battery of emf E and internal resistance R. A current I is observed to flow. Then the n resistors are connected in parallel to the same battery. It is observed that the current is increased 10 times. What is 'n'?

For three resistors of different value connected in series obtain equation of equivalent resistance. From this write equation of n resistors connected in series.

What will be the equivalent resistance of n resistors each having resistance R when connected in series and parallel separately?

Write equation of equivalent resistance of n resistors connected in series.

A set of n identical resistors, each of resistance R Omega , when connected in series have an effective resistance X Omega and when the resistors are connected in parallel, their effective resistance is Y Omega . Find the relation between R, X and Y.

When two resistors of R value connected in parallel what is equivalent resistance '?