Permutation and Combination – Page 26

How-many-3-digited-numbers-which-are-divisible-by-1-3-2-4-3-5-4-6-5-7-6-8-7-9-with-repetetion-of-digits-is-NOT-allowed-one-problem-process-

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Question Number 177309 by SLVR last updated on 03/Oct/22 $H o w m a n y 3 d i g i t e d n u m b e r s$ $w h i c h a r e d i v i s i b l e b y 1) 3$ $2) 4 3) 5 4) 6 5) 7 6) 8 7) 9$ $w i t h r e p e t e t i o n o f d i g i t s i s$ $N O T a l l o w e d \dots o n e p r o b l e m p r o c e s s$ Commented by SLVR last updated…

A-blind-man-is-to-place-5-letters-into-5-pigeon-holes-how-many-ways-can-4-of-the-letters-be-wrongly-placed-note-that-only-one-letter-must-be-in-a-pigeon-hole-

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Question Number 111732 by Aina Samuel Temidayo last updated on 04/Sep/20 $A blind man is to place 5 letters into 5$ $pigeon holes, how many ways can 4 of$ $the letters be wrongly placed ?$ $(note that only one letter must be in a$ $pigeon hole)$ Answered by mr…

Question-46143

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Question Number 46143 by aseerimad last updated on 21/Oct/18 Answered by tanmay.chaudhury50@gmail.com last updated on 22/Oct/18 $52 C_{26} \times 26 C_{26}$ $= \frac{52!}{26! 26!}$ Commented by aseerimad…

Question-177040

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Question Number 177040 by cortano1 last updated on 30/Sep/22 Answered by mr W last updated on 30/Sep/22 $t o t a l n u m b e r o f 9 - d i g i t n u m b e r s i s :$ $9! = 362880$ $${number}\:{of}\:{those}\:{which}\:{are}\:{divisible} \…

Question-177008

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Question Number 177008 by Ar Brandon last updated on 29/Sep/22 Answered by Rasheed.Sindhi last updated on 29/Sep/22 $L e t t i s t o t a l o f c a r d n u m b e r s c h o s e b y p l a y e r s .$ ${E f e}^{'} s c a r d n u m b e r = 3$ $6 ⩽ t ⩽ 20$ $${If}\:{t}\in\mathbb{P}\:{then}\:{possible}\:{values}\:{for}\:{t}: \…

Question-177007

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Question Number 177007 by Ar Brandon last updated on 29/Sep/22 Answered by mr W last updated on 29/Sep/22 $1 . h e b u y s t h e 13^{t h} f l o o r :$ $12^{t h} f l o o r i s a l s o b o u g h t . t o b u y t h e$ $${rest}\:\mathrm{6}\:{floors}\:{there}\:{are}\:{C}_{\mathrm{6}}…

A-teacher-conducts-a-test-for-five-students-He-provides-the-marking-scheme-and-asked-them-to-exchange-their-scripts-such-that-none-of-them-marks-his-own-script-How-many-ways-can-the-students-carry-o

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Question Number 111394 by Aina Samuel Temidayo last updated on 03/Sep/20 $A teacher conducts a test for five$ $students . He provides the marking$ $scheme and asked them to exchange$ $their scripts such that none of them$ $marks his own script . How many ways$ $can the students carry out the$ $$\mathrm{marking}? \…

What-is-the-sum-of-the-coefficients-in-the-expansion-of-2015v-2015u-1-2015-

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Question Number 111393 by Aina Samuel Temidayo last updated on 03/Sep/20 $What is the sum of the coefficients in the$ $expansion of {(2015 v - 2015 u + 1)}^{2015} ?$ Commented by mr W last updated on 03/Sep/20…

In-a-tennis-tournament-n-women-and-2n-men-played-Each-player-played-exactly-one-match-with-every-other-player-If-there-are-no-ties-and-the-number-of-the-matches-won-by-women-to-the-number-of-matches

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Question Number 111275 by Aina Samuel Temidayo last updated on 03/Sep/20 $In a tennis tournament n women and$ $2 n men played . Each player played$ $exactly one match with every other$ $player . If there are no ties and the$ $number of the matches won by women$ $to the number of matches won by men$ $$\mathrm{is}\:\mathrm{7}:\mathrm{5},\:\mathrm{find}\:\mathrm{n}. \…

Tricolours-flags-each-flag-having-three-different-strips-of-non-overlapping-colours-are-to-be-designed-using-white-blue-red-yellow-and-black-strips-How-many-of-the-flags-have-blue-colour-

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Question Number 111272 by Aina Samuel Temidayo last updated on 03/Sep/20 $Tricolours flags (each flag having$ $three different strips of$ $non - overlapping colours) are to be$ $designed using white, blue, red, yellow$ $and black strips . How many of the$ $flags have blue colour ?$ Answered…

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