Mathematics
Easy

Question

# Which number is missing from the sequence?6, 9, 12, ____, 18, 21, 24.

Hint:

## The correct answer is: 15

### The given sequence is 6, 9, 12, __, 18, 21, 24We will subtract the first term from the second term.We will see if we get a constant that we can use to write the complete pattern.9 – 6 = 3Now, we will add this constant to the second term to see if we get the third term. The number sequence of increasing. So, we need to add the constant.9 + 3 = 12This matches the third term of given sequence. So, we will continue the addition to see if we get the last three terms right too.12 + 3 = 1515 + 3 = 1818 + 3 = 21All the terms matches the given pattern.The complete sequence will be 3, 6, 9, 12, 15, 18, 21Therefore, the missing term is 15.

For such questions, we should know the basic operations. When the rule used to write the pattern is not mentioned, we have to use all four operations to check the pattern. The operations are addition, subtraction, division, and multiplication.