four resistor of resistances 1ohm,2ohm,3ohm,5ohm, are connected in series and afterwards in parallel.calculate the combined resistance in each case

Answer 1

this is one of the most basic setups. Clearly you need to do some reading.

series: R = 1+2+3+5 = 11
parallel:
1/R = 1/1 + 1/2 + 1/3 + 1/4
R = 12/25

Answer 2

hydrogen

Answer 3

How did u get
12..and also 25?

Answer 4

how to get 4 get