JEE Main Physics E & M #1 Capacitors in Series and Parallel

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Two equal capacitors are first connected in series and then in parallel, the ratio of the equivalent capacities in the two cases will be{
A) 2:1
B) 1:4
C) 4:1
D) 1:2

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[Prakhar_A]

Your work here is so wonderful... helping out millions of students in such a simple way..just wanted to say thanks and wish you good health...

[abhijeetjondhale]

Thank you sir. I Appreciate your work.

[janda]

How would onw know to take c_s / c_p and not c_p / c_s? If one is just scribbling down everything and just takes one divided over the other without much thought, how would one know it’s 1:4 and not 4:1?