Math Olympiad 5

Pattern Problem( Week 33 Evaluation)

1. What is the next term of the following sequence? 1, 3, 9, 27, 81,

2. How many two-digit numbers are there in which the tens digit is greater than or equal to the ones digit?

3. Lisa is making a necklace by stringing beads of different colors. She strings beads in the order of red, orange, yellow, green, blue, and white. If her necklace design begins with a red bead and ends with a yellow bead, what is the possible number of beads that her necklace could contain?

A) 22

B) 37

C) 20

D) 27

4. 9ⁿ is n 9s multiplied together. What is the end digit of 9¹⁵⁰?

5. Below is a repeating decimal that the set of digits 80123 repeat after the decimal point endlessly.
0.80123 = 0.801238012380123...
Which digit will fall in the 946th place to the right of the decimal point?

6. During the holiday shopping season, Sofia worked at a gift store as a part-time job. The boss of the store set the first day salary and then increased $1 each day after the first day. She earned a total of $308 in 8 days. How much (in dollars) did she earn on the first day?

7. The following sequence of numbers are placed in the table as shown. Note that each number in the sequence is an even number. If the pattern continues, in which column will the number 334 appear?

I	II	III	IV	V	VI
		0	2	4	6
8	10	12	14	16	18
20	22	24	26	28	30
32	...	...	...	...	...

9. The following sequence of numbers are placed in the table as shown. Note that each number in the sequence is a multiple of 3 , and 0 is in the first row. If the pattern continues, what number will appear in the cell corresponding to the 19th row and column IX?

I	II	III	IV	V	VI	VII	VIII	IX	X
				0	3	6	9	12	15
18	21	24	27	30	33	36	39	42	45
48	51	54	57	60	63	66	69	72	75
78	...	...	...	...	...	...	...	...	...

10. Single-color beads of red, orange, yellow, green, or black are placed in a line so that the pattern of red, orange, yellow, green, black, red, orange, yellow, green, black,... repeats throughout. If the first bead in the line is red,which of the following bead is yellow?