Multiply limits: Given lim[n->infy]x_n = 0, [x_n y_n] = 0, which stmt is correct?

[Roberto37]

What we need to observe when we multiply limits?

Sendo $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, x_n\, =\, 0,$ para que

. . .$\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, \left[x_n\, \cdot\, y_n\right]\, =\, 0,$ basta que

. . . . .I) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja negativo

. . . . .II) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja positivo

. . . . .III) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja infinito

. . . . .IV) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja um numero real

a) Only the affirmative I is correct.

b) Only affirmative IV is correct.

c) Only affirmative II is correct.

d) Only affirmative III is correct.

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Thank you.

 

[tkhunny]

What we need to observe when we multiply limits?

Sendo $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, x_n\, =\, 0,$ para que

. . .$\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, \left[x_n\, \cdot\, y_n\right]\, =\, 0,$ basta que

. . . . .I) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja negativo

. . . . .II) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja positivo

. . . . .III) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja infinito

. . . . .IV) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja um numero real

a) Only the affirmative I is correct.

b) Only affirmative IV is correct.

c) Only affirmative II is correct.

d) Only affirmative III is correct.

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Thank you.

"multiply limits" doesn't mean anything.

If the limit exists, it has a value. Multiply the values.

 

[Steven G]

What we need to observe when we multiply limits?

Sendo $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, x_n\, =\, 0,$ para que

. . .$\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, \left[x_n\, \cdot\, y_n\right]\, =\, 0,$ basta que

. . . . .I) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja negativo

. . . . .II) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja positivo

. . . . .III) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja infinito

. . . . .IV) $\displaystyle \displaystyle \lim_{n \rightarrow +\infty}\, y_n$ seja um numero real

a) Only the affirmative I is correct.

b) Only affirmative IV is correct.

c) Only affirmative II is correct.

d) Only affirmative III is correct.

---

Thank you.

Lim (f(x)g(x)) = lim f(x) * lim g(x) if they both exist

 

[Roberto37]

Lim (f(x)g(x)) = lim f(x) * lim g(x) if they both exist

I think the letter b is correct , and you?

 

[Steven G]

i think letter b.

Correct!

 

[Roberto37]

Multiply limits

Correct!

thanks