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Question
By using dot (.) patterns, which of the following numbers can be arranged in all the three ways namely a line, a triangle and a rectangle?
Options
9
10
11
12
MCQ
Solution
10
Explanation:
By using 10 dots, we can make a line, a triangle and a rectangle.
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Study the pattern:
| 1 × 8 + 1 = 9 |
| 12 × 8 + 2 = 98 |
| 123 × 8 + 3 = 987 |
| 1234 × 8 + 4 = 9876 |
| 12345 × 8 + 5 = 98765 |
Write the next two steps. Can you say how the pattern works?
(Hint: 12345 = 11111 + 1111 + 111 + 11 + 1).
