A bag contains 9 identical balls out of which 3 are blue, 2 are white and the remaining are red. If a ball is drawn from the bag what is probability that it is :
1. blue
2.not red.​

Total number of balls  = 9

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)