from collections import Counter, defaultdict

def countTriplets(arr, r):
    left = defaultdict(int)
    right = Counter(arr)
    
    res = 0
    for a in arr:
        right[a] -= 1
        cl = left[a/r]
        cr = right[a * r]
        res += cl * cr
        left[a] += 1
        
    return res