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05 Jul 2024, 03:43
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C
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If two numbers are selected at random from 1,2,3,4 and 5, how many cases are there such that at least one number selected will be an even integer?
A. 5
B. 6
C. 7
D. 8
E. 9
A. 5
B. 6
C. 7
D. 8
E. 9
05 Jul 2024, 05:29
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Two numbers selected are within the given set of (odd, even) combination : { (O,O),(E,O),(O,E),(E,E) }
Ask is at least one Even is selected i.e Total possibility - No Even.
Given set {1,2,3,4,5}, Even {2,4} , Odd {1,3,5}
Total possible ways = 5*4 = 20
No Even i.e both Odd = 3*2 = 6
Therefore, Required answer must be 20-6 = 14
BUT answer is 14/2=7 ---- HOW
Ask is at least one Even is selected i.e Total possibility - No Even.
Given set {1,2,3,4,5}, Even {2,4} , Odd {1,3,5}
Total possible ways = 5*4 = 20
No Even i.e both Odd = 3*2 = 6
Therefore, Required answer must be 20-6 = 14
BUT answer is 14/2=7 ---- HOW
05 Jul 2024, 06:14
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random select 2number from5, equals to 5C2=10
The probability of both is odd is 3/5 * 2/4 = 0.3
the probability of at least one is even equals to 1-0.3=0.7, the answer is 10 *0.7= 7.
Choose C
The probability of both is odd is 3/5 * 2/4 = 0.3
the probability of at least one is even equals to 1-0.3=0.7, the answer is 10 *0.7= 7.
Choose C
