Modular arithmetic

help
1

Shouldn’t the value of y and z be same here:-

x=10**17+4
v=10**9+7

y=((x*(x+1))%v)*pow(2,v-2,v)
print(y%v)

z=int(x/2)*(x+1)
z=z%v
print(z)
2 
int(x/2)!=x//2
3 Likes
3

X is even so it is equal

4

Ohh but it is showing unequal. And X//2
Gives y and z to be same. Thanx

5

x/2 has a liitle bit of error and int(x) is just floor(x). So if instead of 5 it is 4.9999999 you will get 4.