সব প্রশ্নে ফিরে যান
Math
A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?
A) 7-Feb
B) 14-Mar
সঠিক উত্তর
C) 21-Aug
D) 21-May