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Mathematics : Recent Questions and Answers (Page 42)

Find answers to your questions about Mathematics or help others by answering their Mathematics questions.

Remainder when $^{40}C_{12}$ is divided by $7$.

I was solving a binomial summation problem, and I got $^{40}C_{12}$ as the answer. Now, the question demands to find the remainder when it is divided by $7$....

Asked on 12/10/2021 by yash bhatia

2 answer

Showing that for some group it is abelian iff $x • (y • x ^{−1} ) = y$

I have to show that for some group it is abelian iff $x • (y • x^{−1}) = y$.This is what I did:Starting with the given statement...

Asked on 12/10/2021 by cheese12345

2 answer

Summation involving Gamma function

How do I prove the following?- $sqrt{2}sum_{n=0}^{infty} frac{Gamma(2n+1/2)(-at)^n}{n!Gamma(n+1/2)}$=$frac{sqrt{1+sqrt{1+4at}}}{sqrt{1+4at}}$. I think the way to obtain the right-hand side is to show that the summation expansion of left expression can...

Asked on 12/10/2021 by Paranoid

1 answer

Probability one random variable is less than another random variable but higher than the same other random variable with a factor

Consider the two independent random variables $X$ and $Y$. Assume both are uniformly distributed on $[0,1]$. I want to calculate the probability that $X$ lies between...

Asked on 12/10/2021 by sottoj

1 answer

Find x in a multiple arithmetic sequence

Consider the following sequences:A : (4, 7, 10, 13, 16, 19, ...) ..+3B : (3, 10, 17, 24, 31, 38, ...) ..+7C : (8, 19, 30,...

Asked on 12/10/2021 by Billy senders

1 answer

Proof that this is a Primitive Recursive function

Consider the following function:$$varphi(m) = begin{cases} 1 & m = 1 vee bigg( m= 2^n3^k wedge varphi(k)= 1 bigg)\ 0 & o.w.end{cases}$$So $varphi$ evaluates whether an...

Asked on 12/10/2021 by user6767509

2 answer

Convergence and absolute convergence of an infinite product of terms in $(0,1]$.

Let $x_iin(0,1]$ for all $i$. Are the following true, and if so is there a easy proof or citation.$prod_{i=1}^infty x_i = e^{sum_{i=1}^infty log x_i}$ always holds (if...

Asked on 12/10/2021 by LCE

1 answer

Describing the set ${nin Bbb Nlvert (n>1)wedge (forall x,yin Bbb N)[(xy=n)implies (x=1lor y=1)]}$

This set appears in an exercise of the course Introduction to Mathematical Thinking, by Dr.Keith Devlin$A$=${nin Bbb Nlvert (n>1)wedge (forall x,yin Bbb N)[(xy=n)implies (x=1lor y=1)]}$Although this is the...

Asked on 12/10/2021

2 answer

What is the permutation of choosing the just 3 balls in a pool of 16 balls?

I was reading permutation without repetition which says that In a pool if $16$ balls there are $N!$ possibilities, which is,$16 × 15 × 14 ×...

Asked on 12/10/2021 by mahesh87

1 answer

Determine number of divisors of $x^n -1$ of degree $k$. Why are they such a number?

Let us consider the codes $C[n,k]$ where $n=31$ and $k=5$ and base field $mathbb{F}_2$. I know there are ${31}choose{k}$ divisors of $x^ {31}-1$ of...

Asked on 12/10/2021

1 answer

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