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(a) Calculate the total energy stored in two capacitors.

energy stored = 1/2C(deltaV)^2 or Q^2/2C

I been doing this and its marking me wrong.

first i found both charges which is

Q = VC

C1 = 3750 uC

C2 = 900 uC

then i did

3750^2/2(25) = 281250

900^2/2(6) = 67500

i add both up and get 348750 J

It is saying my answer is incorrect and i did this problem 3 different way getting the same number.

does this look like a system error or is my number really off.