prob stat: The p.d.f of a discrete r.v. Y is given by P(Y=y)=cy^2 for y=0,1,2,3,4.

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Given that c is a constant find the value of c.

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Nhận Thua

3:36

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Đức Anh Đặng_1771

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Let f(x) be a polynomial of degree 1. If f(10)-f(5)=15, then f(20)-f(5)=?

1:11

Let f(x) be a polynomial of degree 1. If f(10)-f(5)=15, then f(20)-f(5)=?

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A box contains 8 blue & 6 red socks. What is the number of ways that 2 socks can be drawn ...

1:23

A box contains 8 blue & 6 red socks. What is the number of ways that 2 socks can be drawn ...

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U North Texas Integration Bee 2nd way: x^2/√(x-1) dx

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U North Texas Integration Bee 2nd way: x^2/√(x-1) dx

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Pantun Melayu [Buah cempedak di luar pagar]

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2nd way: integral ∫ log √x(x^n) dx

1:00

2nd way: integral ∫ log √x(x^n) dx

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AI 2008 Hindustan 2nd/2 ways: Evaluate trig integral ∫2cos(x)/(3 sin^3(x)) dx

0:45

AI 2008 Hindustan 2nd/2 ways: Evaluate trig integral ∫2cos(x)/(3 sin^3(x)) dx

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MP 8,93,96,97,99 Hindustan: Evaluate ∫ sec(x)/(sec(x)-tan(x)) dx

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MP 8,93,96,97,99 Hindustan: Evaluate ∫ sec(x)/(sec(x)-tan(x)) dx

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AI 2008 Hindustan: Evaluate integral ∫ 2/3 cos(x)/sin^2(x) dx

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AI 2008 Hindustan: Evaluate integral ∫ 2/3 cos(x)/sin^2(x) dx

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1st way: exp ∫(e^x)/x (1+x log(x)) dx

1:49

1st way: exp ∫(e^x)/x (1+x log(x)) dx

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alternate way: count sum 1 + 2 + 3+... + n via "polynomial"

8:49

alternate way: count sum 1 + 2 + 3+... + n via "polynomial"

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Alternate way: Find 1+2+3+... +(n-1)+n via "polynomial degree 2"

5:18

Alternate way: Find 1+2+3+... +(n-1)+n via "polynomial degree 2"

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2 ways: trig show tan(2x)=2tan(x)/1-tan^2(x))

1:13

2 ways: trig show tan(2x)=2tan(x)/1-tan^2(x))

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2nd/3ways: Laplace Show that ...

3:46

2nd/3ways: Laplace Show that ...

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trig Show cos(4x) = 8 cos^4(x) -cos^2(x)+1

1:03

trig Show cos(4x) = 8 cos^4(x) -cos^2(x)+1

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integral ∫(x^2+2x)/(x^2+2x+2) dx

1:22

integral ∫(x^2+2x)/(x^2+2x+2) dx

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Swinburne U 2nd way: e^(-e^x) e^x dx

0:34

Swinburne U 2nd way: e^(-e^x) e^x dx

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2nd way: trig integral ∫ 1/(3+4sin^2(x)) dx

1:34

2nd way: trig integral ∫ 1/(3+4sin^2(x)) dx

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