Question

please help me to solve this problem
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Answer 1

Answer:

16

Step-by-step explanation:

let green pens be x

then, according to question

18=3x+9

18-9=3x

=9=3x

=9/3=x

=2=x

hence, no of green pens=2

difference=18-2

=16

Answer 2

Answer:

Total Blue Pens: 4

Total Red Pens: 2

Total Black Pens: 3

Total Pens: 4+2+3=9

Probability of drawing 2 blue pens = 9C2 4C2=9×84×3=61

After this, the pens are not replaced, which reduces the number of pens in the pack to 7.

So, the probability of drawing 1 black pen from a pack of 7 pens would be 7C1 3C1=73

Probability of drawing 2 blue pens and 1 black pen =61×73=141.