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# Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

2. ### Guidelines for posting/answering a challenging problem or puzzle

• Replies: 1
• Views: 1,649
October 8th, 2013, 03:20

• Replies: 2
• Views: 46
Today, 03:46
3. ### Trig inequality challenge

• Replies: 0
• Views: 18
Yesterday, 18:51
4. ### Indefinite integration involving exponential and rational function

• Replies: 1
• Views: 133
January 10th, 2017, 07:28
5. ### product with limit

• Replies: 2
• Views: 126
January 8th, 2017, 07:12
6. ### Range of function in [0,1]

• Replies: 2
• Views: 117
January 8th, 2017, 07:07
7. ### Prove (x+y+z)²+(a+b+c)²≥1

• Replies: 4
• Views: 150
January 5th, 2017, 04:49
8. ### prove :1/a^{2n+1}+1/b^{2n+1}+1/c^{2n+1}=1/{a^{2n+1}+b^{2n+1}+c^{2n+1}}

• Replies: 2
• Views: 89
January 1st, 2017, 02:33
9. ### Evaluate a sum

• Replies: 3
• Views: 137
January 1st, 2017, 01:02
10. ### sum of 100 terms (continued)

• Replies: 3
• Views: 128
December 31st, 2016, 17:27
11. ### number of real roots in polynomial equation

• Replies: 3
• Views: 165
December 31st, 2016, 11:00
12. ### Find the sum of three trigonometric terms

• Replies: 2
• Views: 129
December 30th, 2016, 13:17
13. ### Sum of a hundred terms

• Replies: 6
• Views: 238
December 29th, 2016, 09:02
14. ### find f(2002)

• Replies: 16
• Views: 374
December 28th, 2016, 10:14
15. ### Find the area of the "Dodecagon"

• Replies: 1
• Views: 86
December 28th, 2016, 04:54
16. ### prove f(n) is a product of two consecutive positive integers for all n

• Replies: 1
• Views: 89
December 27th, 2016, 08:39
17. ### prove all a_ns are integers

• Replies: 2
• Views: 84
December 26th, 2016, 13:42
18. ### proof in predicate calculus

• Replies: 0
• Views: 67
December 23rd, 2016, 16:03
19. ### Find The Maximal

• Replies: 3
• Views: 120
December 21st, 2016, 09:18
20. ### a convex quadrilateral

• Replies: 1
• Views: 123
December 19th, 2016, 07:48
21. ### Factorization Challenge

• Replies: 2
• Views: 132
December 16th, 2016, 22:05
22. ### Prove 1 ≤ x²+y²+z² ≤ 2

• Replies: 6
• Views: 208
December 14th, 2016, 11:36
23. ### find f(600)

• Replies: 3
• Views: 120
December 8th, 2016, 22:18
24. ### Infinite sum

• Replies: 7
• Views: 325
December 5th, 2016, 19:52
25. ### find min(n)

• Replies: 1
• Views: 121
December 5th, 2016, 17:18
26. ### number of real solution

• Replies: 1
• Views: 138
December 4th, 2016, 23:37
27. ### find max(abs(a)+abs(b)+abs(c)), and a possible f(x)

• Replies: 3
• Views: 146
December 4th, 2016, 01:20
28. ### find x:y:z

• Replies: 2
• Views: 185
December 3rd, 2016, 22:18

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