2 Letters chosen among 6 with no repeat:
a) the first has 6 ways
the second has 5 ways
Then to choose 2 letters among 6, with no repeat, there are 6x5 = 30 ways
b) 3 numbers are taken from the digits 0 through 9 with repeats (total = 10)
the first has 10 ways
the second has 10 ways
the third has 10 ways
Then to choose 3 numbers among 10, with repeat, there are 10x10x10= 1000 ways
And the total serial numbers that can be generated is
30 x 1000 = 3000
F=x+25
b=x-3
x+b=25
b) x-3 +x =25
2x=25+3
x=28÷2
x=14
b= 11
f= 39
Part A: x = 1/26
Part B: x = 1/50
See attached file for the solution/explanation to the 12 questions.
i think its 37....................