Permutation and Combination – Page 8

How-many-words-with-at-least-2-letters-can-be-formed-from-UNUSUALNESS-

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 130193 by mr W last updated on 23/Jan/21 $How many words with at least 2 letters$ $can be formed from UNUSUALNESS ?$ Answered by benjo_mathlover last updated on 23/Jan/21 $U = 3, N = 2, S = 3, (A = L = E = 1)$ $$\:\mathrm{words}\::\:\mathrm{XX}\:=\: $(\begin{matrix} 3 \\ 1 \end{matrix})$ \:=\:\mathrm{3}…

How-many-integers-between-999-and-4000-both-are-included-can-be-formed-using-digits-0-1-2-3-4-if-repetition-of-digits-is-allowed-

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 130034 by EDWIN88 last updated on 22/Jan/21 $How many integers between 999 and 4000$ $(both are included) can be formed using$ $digits 0, 1, 2, 3, 4 if repetition of digits is$ $allowed ?$ Answered by liberty last updated on 22/Jan/21…

How-many-4-letters-word-can-be-formed-from-COMMUNICATION-

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 130019 by I want to learn more last updated on 21/Jan/21 $How many 4 letters word can be formed from COMMUNICATION$ Answered by mr W last updated on 22/Jan/21 $$\mathrm{2}×{C}…

r-0-n-n-C-r-1-r-log-e-10-1-log-e-10-n-r-

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 63845 by gunawan last updated on 10/Jul/19 $\underset{r = 0}{\sum^{n}}^{n} C_{r} \frac{1 + r \log_{e} 10}{{(1 + \log_{e} 10^{n})}^{r}} = \dots$ Commented by gunawan last updated…

The-surnames-of-40-students-in-a-class-were-arranged-in-alphabetical-order-16-of-the-surnames-begin-with-O-while-9-of-the-surnames-begin-with-A-14-of-the-letters-of-the-alphabet-do-not-appear-as-t

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 63596 by Tawa1 last updated on 05/Jul/19 $The surnames of 40 students in a class were arranged in$ $alphabetical order . 16 of the surnames begin with O while$ $9 of the surnames begin with A . 14 of the letters of the$ $alphabet do not appear as the first letter of any surname .$ $(i) What is the probability that the surname of a child picked$ $at random from the class begins with either A or O$ $$\left(\mathrm{ii}\right)\:\:\mathrm{If}\:\mathrm{more}\:\mathrm{than}\:\mathrm{one}\:\mathrm{surname}\:\mathrm{begins}\:\mathrm{with}\:\mathrm{a}\:\mathrm{letter}\:\mathrm{besides}\:\mathrm{A} \…

Arrange-these-digits-1-1-2-2-3-3-4-4-So-that-the-1-s-are-four-digit-apart-So-that-the-2-s-are-three-digit-apart-So-that-the-3-s-are-two-digit-apart-So-that-the-4-s

Tinku Tara June 4, 2023 Permutation and Combination 0 Comments

Question Number 63246 by Tawa1 last updated on 01/Jul/19 $Arrange these digits : 1 1 2 2 3 3 4 4$ $So that the 1^{'} s are four digit apart$ $So that the 2^{'} s are three digit apart$ $So that the 3^{'} s are two digit apart$ $So that the 4^{'} s are one digit apart$ Commented by mr…

Category: Permutation and Combination

How-many-words-with-at-least-2-letters-can-be-formed-from-UNUSUALNESS-

How-many-integers-between-999-and-4000-both-are-included-can-be-formed-using-digits-0-1-2-3-4-if-repetition-of-digits-is-allowed-

How-many-4-letters-word-can-be-formed-from-COMMUNICATION-

r-0-n-n-C-r-1-r-log-e-10-1-log-e-10-n-r-

The-surnames-of-40-students-in-a-class-were-arranged-in-alphabetical-order-16-of-the-surnames-begin-with-O-while-9-of-the-surnames-begin-with-A-14-of-the-letters-of-the-alphabet-do-not-appear-as-t

Arrange-these-digits-1-1-2-2-3-3-4-4-So-that-the-1-s-are-four-digit-apart-So-that-the-2-s-are-three-digit-apart-So-that-the-3-s-are-two-digit-apart-So-that-the-4-s

Question-62022

Question-62014

Question-192960

simplify-n-1-C-r-n-1-C-r-