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)
```

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)
```

```
int(x/2)!=x//2
```

3 Likes

X is even so it is equal

Ohh but it is showing unequal. And X//2

Gives y and z to be same. Thanx

`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.