ABDELRAHMAN SAID ABDELRAHMAN

### Questions (8)

 5 Prove that ${ a }^{ 2 }+2ab+{ b }^{ 2}\ge 0$ without using $(a+b) ^{ 2 }$ 3 prove that $n$ is divisible by $8$ 1 Find the relationship between the sides of a triangle and the diameter of the circumscribed circle. [duplicate] 0 How do I Find the value of this expression? 0 Find sum of two primes if their difference is equal to $3{ n }^{ 2 }-5n-1$

### Reputation (185)

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 2 Find the limit distribution of $Y_n =\frac{\sum_{i=1}^{n}X_i}{\sqrt{\sum_{i=1}^{n}|X_i|^2} }$ 1 For what $p$ values does the series $\sum_{n=1}^\infty \sqrt{n^{p-4}}$ converge? 1 How to expand $(x_1 + x_2 + x_3 + x_4 + x_5 +\cdots+x_n)^{2}$ 0 Show $a+(a+d)+(a+2d)+\cdots+(a+nd)=a(n+1)+d\frac{n(n+1)}{2}$

### Tags (17)

 2 probability × 2 1 calculus 2 probability-theory × 2 1 sequences-and-series 2 central-limit-theorem 0 number-theory × 2 2 law-of-large-numbers 0 elementary-number-theory × 2 1 algebra-precalculus × 5 0 geometry

### Bookmarks (5)

 9 Find the sum $\sum _{ k=1 }^{ 100 }{ \frac { k\cdot k! }{ { 100 }^{ k } } } \binom{100}{k}$ 8 Prove that the number $2a+b+c$ is not a prime number [closed] 5 Prove that ${ a }^{ 2 }+2ab+{ b }^{ 2}\ge 0$ without using $(a+b) ^{ 2 }$ 5 How to solve this hard sum problem? 2 if $A,B,C$ are real numbers such that ,${ A }^{ 2 }+{ B }^{ 2 }+{ C }^{ 2 } = 1$ and $A+B+C = 0$ find the maximum value of $(ABC )^2$ [duplicate]

### Accounts (5)

 Mathematics 185 rep 88 bronze badges Electrical Engineering 31 rep 44 bronze badges Mathematica 1 rep 11 bronze badge Physics 1 rep 11 bronze badge Writing 1 rep 11 bronze badge