consider example
D=5,d=2,P=1,Q=2
So series is
1 1 3 3 5
so i convert it into AP like this by multiplying d in each term
2 6 10
so i am using
AP formula sn=n/2[2a+(n-1)*d] and tn=a+(n-1)*d
my Solution is:
T=int(input())
for i in range(T):
D,d,P,Q=[int(x) for x in input().split()]
n=int(D/d)
a=dP
di=dQ
sum=(n/2)*(2*a+(n-1)*di)
ex=D%d
tn=a+(n)*di
ex=ex*(tn/d)
total=sum+ex
print(int(total))
it passed the first test case but showing error in second
can someone explain me what i am missing