how many ways are there to select 12 countries in the United Nations to serve on a council if 3 are selected from a block of 45 , 4 are selected from a block of 57 and the others are selected form the remaining 69 countries

The  value is  

Step-by-step explanation:

From the question we are told that  

      The  number of countries is  n  =  12

Generally the number of way of selecting 3 from a block of 45  

Generally the number of way of selecting 4 from a block of 57  

Generally the number of way of selecting (12 - (4 + 3) = 5) from a block of 69

The ways of  selecting 12 countries in the United Nations  serve on a council is mathematically represented as

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

2

step-by-step explanation: