21 ball numbered 1 to 21. A ballis drawn and then another ball is drawn without replacement. Options.
A) 3/19
B) 3/31
C) 9/42
D) 4/49
E) 4/51
The probability that first toy shows the even number,   =1021=1021   Since, the toy is not replaced there are now 9 even numbered toys and total 20 toys left.   Hence, probability that second toy shows the even number,   =920=920   Required probability,   =(1021)×(920)=(1021)×(920)   =9/42   9/42
<result>C</result>
21 ball numbered 1 to 21. A ballis drawn and then another ball is drawn without replacement.