148 Answered Questions for the topic discrete mathematics

02/27/14

#### Using arrow diagrams If 7 dice are rolled, and explain why must two at least be the same value?

Using arrow diagrams If 7 dice are rolled, and explain why must two at least be the same value?

02/27/14

#### how many random words...........

Using a standard cell phone keypad, how many random words (just letters strung together) can be produced from the PIN 23579?

02/27/14

#### total number of combinations

Write the total number of possible combinations of 5 dice being rolled at once?

02/27/14

#### give the probability

Write each as a set and then give the probability, of the following happening?a) From a full pack of picture cards (J,Q,K,A) an ace is dealt?b) From a set of a single die that a 4 is rolled?c) From... more

02/23/14

#### verify and explain

Let a = 67, b = 30, and n = 7 Verify and explain that (a-n)≡(mod b)

02/23/14

#### Using a Caesar cipher.........................

. Using a Caesar cipher decrypt the following message and determine the key used.TPIEWI VIEH QIHint: Find the common letters

02/23/14

#### Verify the following statements

Verify the following statementsa)128 ≡ 2 (mod 7) b)149 ≡ 5 (mod 9)c)(45-104)≡(3-2)(mod 6)

02/16/14

#### true or false?

5.:Let f: X →Y be a function.True or False?A sufficient condition for f to be one-to-one is that for all elements y in Ym there is at most one x in X with f(x)= y.

02/16/14

#### For all sets A, B, and C. Assuming each is a subset of a universal set U

For all sets A, B, and C. Assuming each is a subset of a universal set Ua)Is the following true? (A-B)∩ (C-B) = A- (B ∪C) b)Find a counterstatement to (a)

02/16/14

#### Let R={3,4,5,6,7,8,9} ,S={1,3,5} and T={ 2,4,6,8}

Let R={3,4,5,6,7,8,9} ,S={1,3,5} and T={ 2,4,6,8}a)R ∩ Sb)R – Tc)S ∪ T

02/14/14

#### Discrete variable 95% confidence intervals

For a discrete variable with values ranging from 0 to 100, what are the 95% confidence intervals if I sample 100 items? If I sample 200 items. Each sample measurement could be in limited... more

02/05/14

#### find the formula

For Tower of Hanoi, find the formula for the minimum number of moves for n discs.

02/03/14

#### prove the following loop

If the predicate a+b = even is true, the prove the following loop is truewhile (a >= 0 and a <= 100) { a = a + 3; b = b -1;}

02/03/14

#### sum of the first n integers

Use the formula for the sum of the first n integers, to evaluate the following:a) 3 + 6 + 9 + 12 + 15 + 18 + …. + 303b) 6 + 7 + 8 + 9 + 10 + 11 + …. + 102

02/03/14

#### mathematical induction

Use mathematical induction to show that change of at least 14c can be obtained using 3c and 8c coins. Show at least from 14c to 27c

01/29/14

#### Write the following as a ratio of two integers

Write the following as a ratio of two integersa) 0.222222222222b) 3.6666666

01/27/14

If n=4k+3 does 8 divide n^2-1?

01/27/14

#### divisable by 4????????????/

Is 6m(2m+10) divisible by 4?

01/27/14

#### any odd integer????

Prove that is x is any odd integer then ?(-1)?^x = -1

01/27/14

#### determine whether the property is true???

Determine whether the property is true for all integers, true for no integers, true for only some integers. ?(x+y)?^2 = x^2 + y^2

01/20/14

#### mathematical notation

Write the following is mathematical notationa) All cats are friendlyb) Some horses are unrideable

01/20/14

#### rewrite the following statements

Rewrite the following statements in the for ∀x, if ______ then _____ . a)All Perl scripts have more than 30 lines b)All friends are programmers c)All students have a GPA greater than 2.0

01/20/14

#### computer math

. Find the truth set for the following predicates: Hint: answer should be a { set } a) 8/x where x is an integer,the result is in the domain N b) 8 ≤ p^3 ≤ 125 the result is in the domain Z

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