Question

6, 9, 12, 15, 18, ?

• A. 21
• B. 20
• C. 19
• D. 22

Hint:

AP: add 3 each time.

Answer 1

The Correct Option is A

The given sequence of numbers is 6, 9, 12, 15, 18, and we need to find the next number in the sequence. Let's examine the sequence to identify the pattern:

1. Calculate the difference between consecutive numbers:
   • 9 - 6 = 3
   • 12 - 9 = 3
   • 15 - 12 = 3
   • 18 - 15 = 3
2. We observe that the difference between each consecutive number is 3. This indicates that it is an arithmetic sequence with a common difference of 3.
3. To find the next number in the sequence, add the common difference to the last number:
   • Next number = 18 + 3 = 21

Thus, the next number in the sequence is 21.

Therefore, the correct answer is: 21