The Total solution for NCERT class 6-12
From the question it is given that,
P(A) = 5/3 and P(B) = 1/5
Then, P(A or B), if A and B are mutually exclusive
P(A∪B) or P(A or B) = P(A) + P(B)
= (3/5) + (1/5)
= 4/5