Factorial Notation, NPr And NCr
Gbogbo ọrọ náà
Once you know whether order matters, you need fast formulas to do the counting. Factorial notation packs a long product into a single symbol, and from it come the two workhorse formulas of counting: \(^nP_r\) for permutations and \(^nC_r\) for combinations. With these you can count arrangements and selections in one step.
In this lesson you will learn what \(n!\) means, the surprising but essential fact that \(0!=1\), and how to use the permutation and combination formulas confidently. Worked examples like \(^5P_2=20\) and \(^5C_2=10\) show the formulas in action.
Ebumnobi
- Know and use the notation n! (with 0! = 1) and the expressions for permutations and combinations of n items taken r at a time.
- Solve problems on arrangement and selection using permutations or combinations.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Factorial Notation, NPr And NCr. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- What is the value of 5!? A. 25 B. 60 C. 120 D. 720 Answer: C
- What is the value of 0!? A. 0 B. 1 C. undefined D. infinity Answer: B
- Evaluate 5P2. A. 10 B. 15 C. 20 D. 25 Answer: C
- Evaluate 5C2. A. 10 B. 15 C. 20 D. 25 Answer: A
- Which formula gives the number of combinations of r from n? A. n!/(n - r)! B. n!/(r!(n - r)!) C. n! r! D. n!/r! Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
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Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Factorial Notation, NPr And NCr? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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