#include <iostream>
#include <cstdio>
#define mod 998244353
using namespace std;
typedef long long ll;
ll n,x,y,q,fac[5001],inv[5001],f[5001][5001];
ll ksm(ll x,ll y) {
	ll res=1;
	while(y) {
		if(y&1) res=res*x%mod;
		x=x*x%mod;
		y>>=1;
	}
	return res;
}
inline ll binom(ll x) {return fac[x]*inv[x]%mod;}
void init() {
	ll m=min(n,5000ll);
	fac[0]=1;
	for(int i=1;i<=m;++i) fac[i]=fac[i-1]*(n-i+2)%mod;
	ll pro=1;
	for(int i=1;i<=m;++i) pro=pro*i%mod;
	inv[m]=ksm(pro,mod-2);
	for(int i=m;i>=1;--i) inv[i-1]=inv[i]*i%mod;
	ll div=ksm(x-y,mod-2);
	for(int i=0;i<=m;++i)
		for(int j=0;j<=m;++j) {
			if(i==0) f[i][j]=-binom(j)*ksm(y,n+1-j)%mod;
			else f[i][j]=-f[i-1][j];
			if(j==0) f[i][j]+=binom(i)*ksm(x,n+1-i)%mod;
			else f[i][j]+=f[i][j-1];
			f[i][j]=f[i][j]*div%mod;
		}
}
int main() {
	while(scanf("%lld%lld%lld%lld",&n,&x,&y,&q)!=EOF) {
		init();
		ll a,b;
		while(q--) {
			scanf("%lld%lld",&a,&b);
			printf("%lld\n",f[a][b]);
		}
	}
	return 0;
}