1.68 is a rational number and is also a real number. This is true because rational numbers can be written by ratios, and real numbers also include decimals.

5 0

4 years ago

Of the 122 students who took a mathematics exam, 76 correctly answered the first question, 60 correctly answered the second ques

valentina_108 [34]

Answer: 38

Step-by-step explanation:

If P and Q are two different set the their difference is given by P-Q i.e. the number of elements in P bit not Q .

i.e. $P-Q=n(P)-n(P\cap Q)$

Let A be the number of students who correctly answered the first question and B be the number of students who correctly answered the second question .

Given : $n(A)=76$

$n(B)=60$

$n(A\cap B)=38$

Then the number of students who answered the first question correctly, but not the second is given by :-

$A-B=n(A)-n(A\cap B)\\\\=76-38=38$

Hence, the number of students who answered the first question correctly, but not the second is 38.

6 0

3 years ago

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