Find the next element that replace the ? Logically
1, 15, 85, 435, ?
Show answer & explanation
Correct answer: B
Explanation
Series: 1, 15, 85, 435, ?
1 × 5 + 10 = 15
15 × 5 + 10 = 85
85 × 5 + 10 = 435
435 × 5 + 10 = 2175 + 10 = 2185
Hence, ? = 2185