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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
3,150 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
871 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
583 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
568 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
726 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
1,796 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
3,177 views
Suppose that ab = 7 and a^2b + ab^2 + a+b = 80. What is a^2+b^2?
1 answer
371 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
2,074 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
1 answer
604 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
0 answers
397 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
1,042 views
What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?
0 answers
395 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
770 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
582 views
Find the sum of all positive integers less than 1000 ending in 3 or 7.
5 answers
1,678 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
1,645 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
2,440 views
Find the sum of all positive integers less than 1000 ending in 3 or 7.
What is the answer?
0 answers
527 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
4,282 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!
