#include <stdio.h>

typedef long long ll;

const int N = 2e5 + 7, M = 5e3 + 1, K = 1e4 + 7, mod = 998244353;
int a[N], b[N];
ll inv[M + 7], c[M + 7][M + 7], val[K], power[K], ans[M + 7][M + 7];

inline void init(){
	inv[0] = inv[1] = 1;
	for (register int i = 2; i <= M; i++){
		inv[i] = mod - (mod / i) * inv[mod % i] % mod;
	}
}

inline int max(int a, int b){
	return a > b ? a : b;
}

inline ll quick_pow(ll x, ll p, ll mod){
	ll ans = 1;
	while (p){
		if (p & 1) ans = ans * x % mod;
		x = x * x % mod;
		p >>= 1;
	}
	return ans;
}

int main(){
	int n, x, y, q;
	init();
	while (scanf("%d %d %d %d", &n, &x, &y, &q) != EOF){
		int maxa = 0, maxb = 0, maxab, sum;
		for (register int i = 1; i <= q; i++){
			scanf("%d %d", &a[i], &b[i]);
			maxa = max(maxa, a[i]);
			maxb = max(maxb, b[i]);
		}
		maxab = max(maxa, maxb);
		sum = maxa + maxb;
		for (register int i = 0; i <= maxab; i++){
			c[i][0] = 1;
			for (register int j = 1; j <= maxab; j++){
				c[i][j] = c[i][j - 1] * (n - i - j + 1) % mod * inv[j] % mod;
			}
		}
		if (x == 0){
			power[sum] = quick_pow(y, n - sum, mod);
			for (register int i = sum - 1; i >= 0; i--){
				power[i] = power[i + 1] * y % mod;
			}
			for (register int i = 0; i <= maxa; i++){
				for (register int j = 0; j <= maxb; j++){
					ans[i][j] = c[i][j] * power[i + j] % mod;
				}
			}
		} else if (y == 0){
			power[sum] = quick_pow(x, n - sum, mod);
			for (register int i = sum - 1; i >= 0; i--){
				power[i] = power[i + 1] * x % mod;
			}
			for (register int i = 0; i <= maxa; i++){
				for (register int j = 0; j <= maxb; j++){
					ans[i][j] = c[j][i] * power[i + j] % mod;
				}
			}
		} else {
			val[0] = 1;
			for (register int i = 1; i <= sum; i++){
				val[i] = val[i - 1] * (n - i + 1) % mod * inv[i] % mod;
			}
			if (x == y){
				power[sum] = quick_pow(x, n - sum, mod);
				for (register int i = sum - 1; i >= 0; i--){
					power[i] = power[i + 1] * x % mod;
				}
				for (register int i = 0; i <= maxa; i++){
					for (register int j = 0; j <= maxb; j++){
						ans[i][j] = val[i + j] * power[i + j] % mod;
					}
				}
			} else {
				ll q = x * quick_pow(y, mod - 2, mod) % mod, invqd = quick_pow(q - 1, mod - 2, mod), r = quick_pow(q, mod - 2, mod), invrd = quick_pow(r - 1, mod - 2, mod), inv_val = quick_pow(((x - y) % mod + mod) % mod, mod - 2, mod);
				if (q == 1){
					ll temp = 1;
					for (register int i = 0; i <= maxa; i++){
						if (i > 0) temp = temp * (n - i + 1) % mod * inv[i + 1] % mod;
						ans[i][0] = temp * quick_pow(x, n - i, mod) % mod;
					}
				} else {
					power[maxa] = quick_pow(q, n - maxa, mod);
					for (register int i = maxa - 1; i >= 0; i--){
						power[i] = power[i + 1] * q % mod;
					}
					for (register int i = 0; i <= maxa; i++){
						ll val = (quick_pow(q, n - i + 1, mod) - 1) * invqd % mod;
						for (register int j = 1; j <= i; j++){
							val = ((power[i - j] * c[i - j][j] % mod - val) * q % mod * invqd % mod + mod) % mod;
						}
						ans[i][0] = val * quick_pow(y, n, mod) % mod * quick_pow(x, mod - i - 1, mod) % mod;
					}
				}
				if (r == 1){
					ll temp = 1;
					for (register int i = 0; i <= maxb; i++){
						if (i > 0) temp = temp * (n - i + 1) % mod * inv[i + 1] % mod;
						ans[i][0] = temp * quick_pow(y, n - i, mod) % mod;
					}
				} else {
					power[maxb] = quick_pow(r, n - maxb, mod);
					for (register int i = maxb - 1; i >= 0; i--){
						power[i] = power[i + 1] * r % mod;
					}
					for (register int i = 1; i <= maxb; i++){
						ll val = (quick_pow(r, n - i + 1, mod) - 1) * invrd % mod;
						for (register int j = 1; j <= i; j++){
							val = ((power[i - j] * c[i - j][j] % mod - val) * r % mod * invrd % mod + mod) % mod;
						}
						ans[0][i] = val * quick_pow(x, n - i, mod) % mod * quick_pow(y, mod - i - 1, mod) % mod;
					}
				}
				for (register int i = 1; i <= maxa; i++){
					for (register int j = 1; j <= maxb; j++){
						ans[i][j] = ((ans[i][j - 1] - x * ans[i - 1][j] % mod) * inv_val % mod + mod) % mod;
					}
				}
			}
		}
		for (register int i = 1; i <= q; i++){
			printf("%lld\n", ans[a[i]][b[i]]);
		}
	}
	return 0;
}