I 

I am getting 32 answer because I considered

1. All six subjects failed(f) = 12
2. Exactly 5 failed = 0
3. Exactly 4 failed =0
4. Exactly 3 failed (c)=1
5. Exactly 2 failed= 0
6. Exactly 1 Failed =  45-13 = 32

please help me, where am I going wrong?

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