from math import gcd, ceil
 
t = int(input())
while t>0:
	t-=1
	n = int(input())
	rebel = [int(i) for i in input().split(" ")]
	l, u = [int(i) for i in input().split(" ")] #army l u both inclusive
 
	lcm = rebel[0]
	for i in rebel[1:]:
	  lcm = lcm*i//gcd(lcm, i)
 
	m = ceil(l/lcm)
	n = u//lcm
	ans = u-l+1-(n-m+1)
	# print(lcm, n, m, ans)
	print (ans if ans>0 else 0)
 
 

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1
500
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1 1000000000000000000