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Mathematics
Harsh Kumar's user avatar
Harsh Kumar's user avatar
Harsh Kumar's user avatar
Harsh Kumar
  • Member for 7 years, 7 months
  • Last seen more than 4 years ago
  • India
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32
Is every parallelogram a rectangle ??
Dec 23, 2016
11
Find the sum of first $n$ terms of the series: $\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+\cdots +\frac{1}{n\times(n+1)}$
Jan 9, 2017
10
Why is the solution to $x-\sqrt 4=0$ not $x=\pm 2$?
Dec 29, 2016
8
What must be the simplest proof of the sum of first $n$ natural numbers?
Jan 8, 2017
8
Prove that $\frac{x_1}{x_2}+\frac{x_2}{x_3}+\frac{x_3}{x_4}+\cdots +\frac{x_{n-1}}{x_n}+\frac{x_n}{x_1}<2n-1$ [closed]
Jan 10, 2017
6
What is the proof of divisibility by $13$? [duplicate]
Dec 16, 2016
6
Find sum of numbers from $1-100$ which are not divisible by $3$ and$ 7$
Jan 2, 2017
6
Show that $e^n>\frac{(n+1)^n}{n!}$ without using induction.
Dec 20, 2016
5
Let $a,b,c$ be the length of sides of a triangle then prove that $a^2b(a-b)+b^2c(b-c)+c^2a(c-a)\ge0$ [duplicate]
Dec 12, 2016
5
The largest value of $n$ such that $n+10| n^3+100$ [duplicate]
Dec 18, 2016
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What will happen to a Bounty?
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32
What roles do neutrons play in an atom?
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Why are light rays able to cross each other?