Probability Practice Test 1

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Question : 38 of 40

Marks: +1, -0

From eighty cards numbered 1 to 80, two cards are selected randomly. The probability that both the cards have the numbers divisible by 4 is given by

$21/316$
$19/316$
$1/4$
None of these

Solution:

Total ways

= ^80C_2

favourable ways

= ^20C_2

P={^20C_2}/{^80C_2}=19/316

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