In the following series, how many ‘8’s are there which are not preceded by ‘7’ and followed by ‘9’?
7, 8, 9, 8, 8, 5, 4, 3, 5, 8, 8, 7, 1, 8, 9
🎥 Video solution / Text Solution of this question is given below:
Check each ‘8’:
1️⃣ 7 8 9 → preceded by 7 and followed by 9 ❌
2️⃣ 9 8 8 → preceded by 9, followed by 8 ✅
3️⃣ 8 5 4 → ✅
4️⃣ 5 8 8 → ✅
5️⃣ 8 7 1 → ❌ followed by 7
6️⃣ 7 1 8 9 → ❌ (preceded by 7, followed by 9)
So valid 8’s = 3