The pattern of a sequence is: 1, 3, 6, 10, 15, ?. What is the next number in the sequence?
Q1. The pattern of a sequence is: 1, 3, 6, 10, 15, ?. What is the next number in the sequence?
Answer: 21
Explanation: Pattern formed by adding 2, 3, 4, 5, etc., 21 is the next number in sequence.