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Category: Permutation and Combination

the-family-A-has-5-members-and-the-family-B-has-4-members-there-are-6-personsfrom-other-families-in-how-many-ways-can-you-arrange-these-15-persons-around-a-round-table-such-that-no-member-from-fami

Question Number 195964 by mr W last updated on 15/Aug/23 thefamilyAhas5membersandthefamilyBhas4members.thereare6personsfromotherfamilies.inhowmanywayscanyouarrangethese15personsaroundaroundtablesuchthatnomemberfromfamilyAandnomemberfromfamilyBare$${next}\:{to}\:{each}\:{other}?…

how-many-different-words-can-be-formed-from-the-letters-in-aaacdefgbbbb-such-that-a-a-and-a-b-are-not-next-to-each-other-see-also-Q-195606-

Question Number 195672 by mr W last updated on 07/Aug/23 howmanydifferentwordscanbeformedfromthelettersinaaacdefgbbbbsuchthataaandabarenotnexttoeachother?You can't use 'macro parameter character #' in math mode

sequence-of-string-said-to-be-orderly-if-element-index-i-different-to-i-1-for-example-aba-has-orderly-value-2-abab-has-orderly-value-3-abaabb-has-orderly-value-3-if-there-are-7-a-and-13-b-exa

Question Number 195666 by uchihayahia last updated on 07/Aug/23 sequenceofstringsaidtobeorderlyifelementindexidifferenttoi+1forexampleabahasorderlyvalue2ababhasorderlyvalue3abaabbhasorderlyvalue3$$\:{if}\:{there}\:{are}\:\mathrm{7}\:{a}\:{and}\:\mathrm{13}\:{b} \

Soit-x-gt-1-On-de-finie-la-suite-p-n-par-p-1-x-et-n-IN-p-n-1-2p-n-2-1-Montrer-que-lim-n-k-1-n-1-1-p-k-x-1-x-1-

Question Number 194960 by Erico last updated on 20/Jul/23 Soitx>1.Ondefinie´lasuite(pn)parp1=xetnINpn+1=2pn21$$\mathrm{Montrer}\:\mathrm{que}\:\underset{\mathrm{n}\rightarrow+\infty} {\mathrm{lim}}\:\underset{\mathrm{k}=\mathrm{1}} {\overset{\mathrm{n}} {\prod}}\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{p}_{\mathrm{k}} }\right)=\sqrt{\frac{{x}+\mathrm{1}}{{x}−\mathrm{1}}}…

Prove-that-n-IN-k-1-2-n-1-1-sin-2-kpi-2-n-1-2-2n-1-2-3-Give-in-terms-of-n-k-1-2-n-1-1-sin-4-kpi-2-n-1-

Question Number 194638 by Erico last updated on 12/Jul/23 ProvethatnIN2n1k=11sin2(kπ2n+1)=22n+123$$\mathrm{Give}\:\mathrm{in}\:\mathrm{terms}\:\mathrm{of}\:{n}\:\:\:\underset{{k}=\mathrm{1}} {\overset{\mathrm{2}^{{n}} −\mathrm{1}} {\sum}}\:\frac{\mathrm{1}}{{sin}^{\mathrm{4}} \left(\frac{{k}\pi}{\mathrm{2}^{{n}+\mathrm{1}}…

If-log-a-y-1-3-and-log-8-a-x-1-then-show-that-y-2-x-1-

Question Number 193368 by MATHEMATICSAM last updated on 11/Jun/23 Iflogay=13andlog8a=x+1thenshowthaty=2x+1 Answered by aba last updated on 11/Jun/23 $$\mathrm{log}_{\mathrm{8}} \mathrm{a}=\mathrm{x}+\mathrm{1}\:\Rightarrow\:\mathrm{ln}\left(\mathrm{a}\right)=\mathrm{3}\left(\mathrm{x}+\mathrm{1}\right)\mathrm{ln}\left(\mathrm{2}\right)\:\Rightarrow\:\mathrm{ln}\left(\mathrm{a}\right)=\mathrm{3ln}\left(\mathrm{2}^{\mathrm{x}+\mathrm{1}}…