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Harsh Kumar

India

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10
Why is the solution to $x-\sqrt 4=0$ not $x=\pm 2$?
math.stackexchange.com

10
Find the sum of first $n$ terms of the series: $\frac{1}{1\times2}+\frac{1}{2\times3}+\frac{1}{3\times4}+\cdots +\frac{1}{n\times(n+1)}$
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8
Proving area of triangle formed at parallelogram midpoint is 1/4 of the parallelogram?
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7
How do I solve quadratic equations when the coefficients are complex and real?
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7
Is the Charge on proton is $3.2\times10^{-19}$ greater than that of charge on electron?
physics.stackexchange.com

6
What must be the simplest proof of the sum of first $n$ natural numbers?
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6
prove that all lines $ax+y=b$ such that coefficients $a, 1, b$ constitute arithmetic sequence have one common point
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6
Show that $e^n>\frac{(n+1)^n}{n!}$ without using induction.
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5
Find sum of numbers from $1-100$ which are not divisible by $3$ and$ 7$
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5
The sum of digits in a 2-digit number
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5
Finding the unknown area.
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5
Solve the equation $5x^2+5y^2-8xy-2x-4y+5=0$
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5
Show that $ f(x)=x^{1000}-x^{500}+x^{100}+x+1=0 $ has no rational roots.
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5
Is Darkness Faster Than Light?
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5
Determine where a point lies in relation to a circle, is my answer right?
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5
What is the role of pillars in bridges?
physics.stackexchange.com