Question

Explanation of inclusion and exclusion principle formula

score 518 · Answer 1 · 2017-07-29 23:16:59

518

Views

Explanation of inclusion and exclusion principle formula

Published on 29 Jul 2017 - 23:16

score 418 · Answer 2 · 2017-07-30 04:36:19

418

Views

Find the number of rearrangements of the string 12345 in which none of the sequences 12, 23, 34, and 45 occur.

Published on 30 Jul 2017 - 4:36

score 171 · Answer 3 · 2017-07-30 06:03:31

171

Views

Find the number of five-digit combinations from the set $\{1,2,3,4,5\}$ in which no digit occurs more than twice.

Published on 30 Jul 2017 - 6:03

score 301 · Answer 4 · 2017-07-30 11:44:20

301

Views

From a standard deck of cards, the kings and queens are removed and arranged in a random order...

Published on 30 Jul 2017 - 11:44

score 790 · Answer 5 · 2017-07-30 11:50:50

790

Views

Find the number of five-digit strings, using digits from $\{0, 1, . . . , 9\}$ in which there are no three consecutive equal digits.

Published on 30 Jul 2017 - 11:50

score 99 · Answer 6 · 2017-07-31 07:11:42

99

Views

The number of primes strictly between $p_n$ and $(p_{n+1})^2$.

Published on 31 Jul 2017 - 7:11

score 581 · Answer 7 · 2017-08-02 10:22:36

581

Views

Suppose that you have a set of 12 colored balls, two each of six different colors $C_{1}$ through $C_{6}$...

Published on 02 Aug 2017 - 10:22

score 325 · Answer 8 · 2017-08-04 08:46:33

325

Views

Find the number of seven-letter words that use letters from the set $\{\alpha,\beta,\gamma,\delta, \epsilon\}$...

Published on 04 Aug 2017 - 8:46

score 974 · Answer 9 · 2017-08-04 09:36:00

974

Views

Find the number of seven-letter words that use letters from the set $\{\alpha, \beta, \gamma\}$

Published on 04 Aug 2017 - 9:36

score 459 · Answer 10 · 2017-08-05 00:31:32

459

Views

Use inclusion/exclusion to find the number of derangements of each of the following strings.

Published on 05 Aug 2017 - 0:31

score 192 · Answer 11 · 2017-08-05 00:48:28

192

Views

Find the number of rearrangements of the string 123456 in which none of the sequences 123, 321, 456, and 654 occur.

Published on 05 Aug 2017 - 0:48

score 374 · Answer 12 · 2017-08-06 03:41:59

374

Views

Find the number of rearrangements of the string 12345 in which none of the sequences 12, 23, 34, 45, and 51 occur.

Published on 06 Aug 2017 - 3:41

score 1.2k · Answer 13 · 2017-08-06 23:08:40

1.2k

Views

Use inclusion/exclusion to find the number of derangements of the string aabbcc

Published on 06 Aug 2017 - 23:08

score 185 · Answer 14 · 2017-08-21 12:29:06

185

Views

How many students are not enrolled in any of these three courses?

Published on 21 Aug 2017 - 12:29

score 633 · Answer 15 · 2017-08-28 21:17:58

633

Views

A question about permutations without fixed point

Published on 28 Aug 2017 - 21:17

List Question

Explanation of inclusion and exclusion principle formula

Find the number of rearrangements of the string 12345 in which none of the sequences 12, 23, 34, and 45 occur.

Find the number of five-digit combinations from the set $\{1,2,3,4,5\}$ in which no digit occurs more than twice.

From a standard deck of cards, the kings and queens are removed and arranged in a random order...

Find the number of five-digit strings, using digits from $\{0, 1, . . . , 9\}$ in which there are no three consecutive equal digits.

The number of primes strictly between $p_n$ and $(p_{n+1})^2$.

Suppose that you have a set of 12 colored balls, two each of six different colors $C_{1}$ through $C_{6}$...

Find the number of seven-letter words that use letters from the set $\{\alpha,\beta,\gamma,\delta, \epsilon\}$...

Find the number of seven-letter words that use letters from the set $\{\alpha, \beta, \gamma\}$

Use inclusion/exclusion to find the number of derangements of each of the following strings.

Find the number of rearrangements of the string 123456 in which none of the sequences 123, 321, 456, and 654 occur.

Find the number of rearrangements of the string 12345 in which none of the sequences 12, 23, 34, 45, and 51 occur.

Use inclusion/exclusion to find the number of derangements of the string aabbcc

How many students are not enrolled in any of these three courses?

A question about permutations without fixed point

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