Question

You are giving two resistors R1 and R2 . How will you connect them to get: (1) high resistance (2) least resistance.

Answer 1

1) for higher. in series
2) for lower. in parallel

Answer 2

for high resistance, I will connect the resistors in series. For lowest resistance I'll connect them in parallel.
equivalent resistance of resistors in series= R1+R2
equivalent resistance of resistors in parallel=1/R1+1/R2