If the mean of 2,4,6,8,a,b is 5, find a+b.
Find the value of a+b
Mean =sumofallobservationstotalnumberofobservations
∴5=2+4+6+8+a+b6
⇒30=20+a+b
⇒a+b=10
Hence, the value of a+b is 10
Let A = {1, 2, 3, 4, 5, 6} and B = {2, 4, 6, 8}. Find A - B and B - A.