Suppose S and T are mutually exclusive events. Find P (S or T) ? sp (S) = 6/11 and p (t) = 1/10

Using P (A∪B) = P (A) + P (B) - P (A∩B)

If we apply this in the question

Then P (S∪T) = P (S) + P (T) - P (S∩T)

= 6/11 + 1/10 - P (S∩T)

= 71/110 - P (S∩T)

But events S and T are mutually exclusive events therefore,

P (S∩T) = 0,

Hence P (S∪T) = 71/110