What number is the product of two different prime numbers greater than 7

1 answer:

3 0

So just take 2 prime numbers that are greater than 7 and multiply them gotoeher prime numbers can be evenly divided by 1 and themselves 9 is not prime becuase it can be divided by3 and get 3 11 is prime becua seit can be only divided by 11 so some numbers prime that are greater than 7 11,13,17,19 let's pick the smaller ones for easy multipy 11 times 13=143 one such number is 143

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At Venn diagram there are 4 parts (20 pieces):

1. Colored only in blue - quadrilaterals with four equal side lengths (3 pieces);

2. Colored only in orange - quadrilaterals with four right angles (6 pieces);

3. Colored in both blue and orange - quadrilaterals with four right angles and with four equal side lengths (2 pieces);

4. Colored in white - quadrilaterals withoutprevious two properties (9 pieces).

Consider events:

A - a randomly chosen quadrilateral has four right angles;

B - a randomly chosen quadrilateral has four equal side lengths;

Use formula $Pr(B|A)=\dfrac{Pr(A\cap B)}{Pr A}$ to find the probability that a randomly selected quadrilateral with 4 right angles also has four equal side lengths: