To balance out the equation, use the combination formula n C r = n! r! (n − r)! and insert the value of r = 1 in the formula, then solving it by opening the factorial of the numerator.

(n-1)!/2 Shortcuts 1. nPr = n (n - 1) (n - 2) .... to r terms. Example : 7P3 = 7 x 6 x 5 = 210 2. nCr = [n (n - 1) (n - 2) ... to r terms]/r! Example : 7P3 = [7 x 6 x 5]/ [3 x 2 x 1] = 35 3. nCr = nCn-r (we …

nCr = n! (n−r)!r! Was this answer helpful?

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To find the factorial of the number n, multiply the number n with (n-1) till it reaches to 1. To understand let us find the factorial of 4. So, equation (ii) gives the final sum of the required series. Hence, option (a) is correct.

2020年10月17日 · Step-by-step explanation: In the binomial expansion (a+b)^n = nC0a^n. b^0 + nC1 a^ (n-1)b^1 + nC2a^ (n-2)b^2 + etc If you now let a=b=1 (1+1)^n =2^n = nC0 + nC1 +nC2 +. etc . In fact what we have here is the number of subsets of size r taken from a set of n objects. nC0 = 1 = number of sets containing zero elements nC1 = n = " ". " " 1. "

2023年5月17日 · 1 Nanocoulomb [nC] = 0.000 000 001 Coulomb [C] – Measurement calculator that can be used to convert Nanocoulomb to Coulomb, among others. How do you convert nC to UC? To convert a nanocoulomb measurement to a microcoulomb measurement, divide the electric charge by the conversion ratio.

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nC r= (n−r)!r!n! Was this answer helpful? Click a picture with our app and get instant verified solutions.

2021年4月8日 · The value of \ (\begin {vmatrix} 1 & 1 & 1 \\ n_ {C_1} & {n+2}_ {C_1} & {n+4}_ {C_1} \\ n_ {C_2} & {n+2} ... } \end {vmatrix}\) is A. 2 B. 4 C. 8 D. n2