What is the effective resistance value of 3 equal resistance 3 Ohm each when grouped in series

What is the effective resistance value of 3 equal resistance 3 Ohm each when grouped in parallel.

What is resistance ?

What is the effect of air resistance on the projectile motion ?

Correct the sentences if required changing the underlined portion. To decrease the effective resistance the given resistors are to be connected in series.

Deduce an expression for the effective capacitance when number of parallel plate capacitors are grouped in (a) series and (b) parallel.

A conducting wire of resistance R is halved. Find the effective resistance when the two halves are joined in (a) series (b) parallel.

Correct the following statement. The effective capacitance increases when number of capacitors are grouped in series.