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illustrate
Selecting an odd number or a number less than 3 from numbers 1 to 8.​


Sagot :

Step-by-step explanation:

P(A) odd number= 1,3,5,7 or 4 numbers out of 8 or 4/8

P(B) Numbers less than 3 = 1 and 2. or 2 numbers out of 8 pr 2/8

P(A and B) numbers you can see in A and B = 1 , 1 number out of 8 pr 1/8

formula:

P(AorB) = P(A)+P(B)-P(A and B)

= 4/8 + 2/8 - 1/8

= 6/8 - 1/8

= 5/8

why do we need to subtract it from P(A and B)?

Since we have only one 1 from the numbers from 1 to 8 and we can't count it double.