import sys
sys.set_int_max_str_digits(0)

t = int(input())

def nC2(n):
	return n*(n+1)//2
for _ in range(t):
	n,m = map(int,input().split())
	p = n//m
	d = n%m
	
	p %= m

	ans = (nC2(m-1) * p + nC2(d))%m
	
	print(ans)