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GRE考試數(shù)學(xué)考試要點(diǎn)

2024-09-04 10:21:04 來(lái)源:中國(guó)教育在線

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GRE考試數(shù)學(xué)考試要點(diǎn)

If (x-c) is a factor of the polynomial p(x), then c is a root of p(x).

We can find the real roots of polynomial p(x) by finding all the factors of p(x).

Example:

p(x)=x2+3x+2=(x+1)(x+2). Two real roots of p(x) are -1 and -2.

Remember:

To find if c is a root of p(x), evaluate p(c) and check if p(c)=0.

If x is a common factor of p(x), then zero is a root of p(x).

GRE數(shù)學(xué)考點(diǎn)介紹:Multiple Times

If probability of an event happening is p, then the probability that the event happens n times in a row is p∧n.

Example:

The probability that a coin toss results in head is 0.5. Then the probability that when the coin is tossed twice, both of them are head is 0.5∧2=0.25.

Probability that a roll of a six-sided die land with face 1 is 1/6. Then the probability that 1 will turn up three times in a row is (1/6)∧3.

Remember:

Note that probability of the event happening does not change from trial to trial.

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