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Rebecca's user avatar
Rebecca's user avatar
Rebecca
  • Member for 9 years
  • Last seen more than 5 years ago
11 votes
4 answers
14k views

Why do the columns of a unitary matrix form an orthonormal basis?

4 votes
3 answers
106 views

How to evaluate $\lim\limits_{n \to\infty} \left|\frac{(n+1)^n x^{(n+1)}}{n^n}\right|$?

3 votes
5 answers
118 views

Ratio Test and $\sum \frac{n^n}{4^n\cdot n!}$

2 votes
4 answers
109 views

if $40|a^2$ prove that $20|a$ when $a$ is an integer

2 votes
2 answers
1k views

Probability of rolling a sum of at least 18 with 10 6-sided dice

1 vote
0 answers
28 views

Determining an integer to approximate error using the Alternating Series Test

1 vote
3 answers
4k views

True or False: $\operatorname{gcd}(a,b) = \operatorname{gcd}(5a+b, 3a+2b)$

0 votes
2 answers
3k views

Conditional Probability - Cancelling the numerator with denominator...

0 votes
1 answer
69 views

Normalize vector : $ \left(\frac{e^{\frac{-i\pi}{4}}}{\sqrt{10}}, -3\frac{e^{\frac{i\pi}{4}}}{\sqrt{10}} \right)$

0 votes
1 answer
99 views

Is it true that if $x^2$ > $y^2$, then $x<y^2$?

0 votes
1 answer
110 views

Proof Regarding Effective Annual Rate Inequality