3. A safe is locked by a combination of of four binary digits (that is, 0 or 1), but the owner has forgotten the combination. The safe is designed in such a way that no matter how many digits have been pressed, if the correct combination of three digits is pressed at any point, then the safe automatically opens (there is no "enter" key). Our goal is to find the minimum number of digits that one needs to key in in order to guarantee that the safe opens. In other words, we wish to find the smallest possible longth of a binary so uence containing eueru four-digit sequen in it

Provide a counterexample for the following statement:  1.Every shape with four angles is a square.  2.If a real number is not negative, then it is positive.  3.All people with brown hair have brown eyes or are short.  4.If a and b are integers where a is divisible by b and b is divisible by a, then a is equal to b.  5.If n-squared is greater than zero, then n is greater than zero.  6.If n is an even number, then n2 + 1 is a prime number. 7.If n is an integer that is positive, then n3 is greater than n-factorial. 8.The result of 3n + 5 is an even integer if and only if n is an odd integer. 9.The result of 3n + 2 is an even integer if and only if the number n is an even integer. 10. Find two even integers whose sum is not a multiple of 4. In other words, the result of n1 + n2 is not divisible by 4.

2. Which of the following statements is true about patients communicating in a second language? O It is advisable to speak loudly with such patients. Medical terminology can be confusing for such patients. It is best to bring in a translator when communicating with such patients. It is unlikely that such patients will face any problems because medical vocabulary is standard

On the internet, is there anything you can do to distinguish between fact and fiction?