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(x + y)^n: Coefficient of term x^(n-k) y^

**k**=**C**(n, k) x^97: Coefficient of x^(100-3) (-1)^3 is C(100...3 Answers · Science & Mathematics · 12/01/2018

... AB = BA, then (A + B)^k = Σ(j = 0 to

**k**)**C**(k, j) A^j B^(k-j). For instance, look at the case when k = 2...1 Answers · Science & Mathematics · 21/12/2017

frequency for k->0 wave: wp. This is the lowest frequency. v_phase = w/

**k**=**c**sqrt( 1 + wp^2/(ck)^2 ) v_group = dw/dk = c / sqrt( 1 + wp^2 / (c^2 k^2))1 Answers · Science & Mathematics · 18/12/2017

y' + x*y = 130x This is linear differential equation therefore the answer is y = y_h + y_p; solve first for y_h y' + x*y = 0 -> y' = -x*y -> y'/y = -x -> ln(y) =

**C**- ((x^2)/2) -> y = e^[**C**- ((x^2)/2)] -> y =**C***exp(-(x^2)/2); Now solve for y_h by...2 Answers · Science & Mathematics · 14/12/2017

Δn for this reaction is 2-4 = -2 (moles of gaseous products minus moles of gaseous reactants) Kp = Kc (RT)^Δn 0.621 = Kc (0.08206 X484K) ^-2 Kc = 0.0985 R is used with pressure in...

1 Answers · Science & Mathematics · 04/12/2017

.../r^2 0.5mv^2 = -C/r + K v = 0 at r = 1.2 x 10^11

**K**=**C**/1.2 x 10^11 at r= infinity v = 3 x 10^7 0.5(4.5 x 10^4)(3 x10^7)^2 =**C**...2 Answers · Science & Mathematics · 03/12/2017

Our victims won't be talking; and we,too, keep it entirely to ourselves. We don't repeat what we say to ourselves to anybody else.

1 Answers · Entertainment & Music · 26/11/2017

If a = nc + k and b=nd + k (where

**k**,**c**, and d are integers), then a - b = (nc + k) - (nd + k) = n(c - d), which...1 Answers · Science & Mathematics · 26/11/2017

Heat gained or lost = specific heat x mass of sample x temperature change. A change of 1 oC equals of change of 1oK Heat gained by water: 4.18 Joules/gK x 75.0 g x (28.3-24.9

**C**) = 1066 Joules Heat lost by...1 Answers · Science & Mathematics · 02/11/2017

Binomial probability formula: P(X=

**k**) =**C**(n,k) * p^k * q^(n-k) n : number of trials (15) k : number...2 Answers · Science & Mathematics · 01/11/2017

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