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Speedo
Questions (20)
In how many ways can you spell the word COOL in the grid below? You can start on any letter, then on each step you can step one
7 answers
3,176 views
There are 5 boys and 4 girls in my class.
In how many ways can they be seated in a row of 9 chairs such that at least 3 girls are
4 answers
884 views
There are 5 boys and 4 girls in my class.
In how many ways can they be seated in a row of 9 chairs such that at least 2 boys are
5 answers
602 views
There are 5 boys and 4 girls in my class.
In how many ways can they be seated in a row of 9 chairs such that at least 2 boys are
1 answer
599 views
The sequence x_1, x_2, x_3, . . ., has the property that x_n = x_{n - 1} + x_{n - 2} for all n \ge 3. If x_{11} - x_1 = 99, then
3 answers
739 views
The sequence x_1, x_2, x_3, . . ., has the property that x_n = x_{n - 1} + x_{n - 2} for all n>=3. If x_{11} - x_1 = 99, then
4 answers
1,805 views
Find the ordered quintuplet (a,b,c,d,e) that satisfies the system of equations a+2b+3c+4d+5e=177,
2a+3b+4c+5d+e=154,
2 answers
3,197 views
Suppose that ab = 7 and a^2b + ab^2 + a+b = 80. What is a^2+b^2?
1 answer
383 views
Alpha writes the infinite arithmetic sequence 10, 8, 6, 4, 2, 0...
Beta writes the infinite geometric sequence 9, 6, 4, 8/3,
2 answers
2,097 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
1 answer
619 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
0 answers
414 views
In the top row of an 8*8 chessboard, Tom writes the values 1, 2, 4, 8, 16, 32, 64, 128. In the leftmost column, Tom writes the
3 answers
1,055 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
0 answers
410 views
A certain infinite geometric series has first term 7 and sum 4. What is the result when the third term is divided by the second
1 answer
785 views
The 23rd term in a certain geometric sequence is 16 and the 28th term in the sequence is 24. What is the 43rd term?
It is not 48.
3 answers
599 views
Find the sum of all positive integers less than 1000 ending in 3 or 7.
5 answers
1,691 views
Let a_1, a_2, . . . , a_10 be an arithmetic sequence. If a_1 + a_3 + a_5 + a_7 + a_9 = 17 and a_2 + a_4 + a_6 + a_8 + a_{10} =
3 answers
1,662 views
A certain 300-term geometric sequence has first term 1337 and common ratio -1/2. How many terms of this sequence are greater
2 answers
2,464 views
Find the sum of all positive integers less than 1000 ending in 3 or 7.
What is the answer?
0 answers
545 views
The 23rd term in a certain geometric sequence is 16 and the 28th term in the sequence is 24. What is the 43rd term?
What is the
7 answers
4,302 views
Answers (9)
could be 5 or 7
I tried like 10 different answers and they were all wrong.
the question mark is a ! not a ?
sorry, i mean you are correct? but how about number 2. That was harder for me.
no reply
everything got confusing after that
19
This is what you did wrong, i think. YOu multiply not add.
Thanks, guys!
