Jimmy Evans
3.6K posts


@Puzzlesonly 13 =13 (the odd numbers remain the same while the even ones become zero...)
English

@Afghan_Engineer The resistors are connected in parallel so the
total resistance between A and B is Rtotal = 18/2 = 9 Ω

English


@sonukg4india (x-1)! . (x-2)! / x! = (x-2)! / x =1 / 2 => x = 2. (x-2)! , x>2
Let f(x) = 2.(x-2)! - x, x > 2
for x = 3 : f(3)= 2.(x-2)! - 3 = 2(3-2)! -3 = 2 -3 = -1 < 0
for x = 4 : f(4) = 2.(4-2)! -4 = 4-4 = 0, so x = 4 is the unique root of the equation because f(x)> 0 for every
x>=5

English

@Dussyme a, b = roots of the equation x^2 - 30x + 200 = 0 =>
x= 15+(-)5 hence a= 20 and b = 10 or a = 10
and b = 20
so a - b =10 or a - b = - 10
English













































