Question

2 persons a and b attempt independently to solve a puzzle. the probability that a will solve a problem is 3/5 and the probability that b will solve the is 1/3. find the probability that the puzzle will be solved by atleast one of them.
can someone please help me ​

Answer 1

for that addition of 3/5 and 1/3 should be equal to 1. as 3/5 + 1/3 is not equal to 1 the probability is 14/15