The answer you are looking for is -5
2,3,4,1, the probability is in order from greatest to least. If they asked for least to greatest then, 1,4,3,2. So use the least to greatest one.

by using the integration formula
we get,

now put the value of t=\sin\theta in the above equation
we get,

hence proved
Fifty , 50 20+30=50, not sure if its asking much else
Answer is b have a good day too enjoy the answe