Let us find the rule of the pattern: 81, 27,
9,…
• What could we do to 81 to get 27?
• We have to divide 81 with 3 to get 27.
• Similarly, what could we do to 27 to get 9?
• We have to divide 27 with 3 to get 9.
• Similarly, to continue with the pattern we
have to divide the number with 3.