List questions from arithmetic-progressions

Published on 30 Sep 2017 - 21:49

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Alernative way of solving summation $5+55+555+\ldots$

Published on 27 Mar 2026 - 3:42

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In a triangle $ABC$, if $\sin A$, $\sin B$ and $\sin C$ form an A.P, prove that $\cot (A/2)\cot(C/2) = 3$.

Published on 07 Oct 2017 - 16:42

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Pre-calculus- Finding the sum of $1.2+2.3x+3.4x^2...$ where $|x|<1$

Published on 09 Oct 2017 - 5:57

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Arithmetic Series: find the sum of 25 terms given 2 terms and their values

Published on 14 Oct 2017 - 3:10

43

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How many squares can form an arithmetic progression?

Published on 26 Mar 2026 - 17:30

182

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Solving $\left(1+3+5...+(2n+1)\right ) + \left(3.5+5+6.5+...+(\frac{7+3n}{2})\right)=105$

Published on 26 Mar 2026 - 6:30

100

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An interesting problem on arithmetic progression and maxima-minima

Published on 21 Oct 2017 - 13:28

102

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Find the value of $\sum_{p=0}^{\infty}\sum_{q=0}^{\infty} \frac{2^{-p-q}}{1+p+q}$

Published on 25 Oct 2017 - 4:08

743

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How does one evaluate $1+2-3-4+5+6-7-8+\cdots+50$?

Published on 28 Oct 2017 - 9:55

777

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Finding how many unit triangles in 10 rows?

Published on 06 Nov 2017 - 0:01

391

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How can I get the first element in this sequence?

Published on 07 Nov 2017 - 17:41

89

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Summation with variables

Published on 12 Nov 2017 - 16:39

123

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Sequences and series help. Finding the first term and the common difference.

Published on 14 Nov 2017 - 21:57

118

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Find value of $a_{2012}$

Published on 17 Nov 2017 - 16:37

List Question

How to prove this result related to A.P.?

Alernative way of solving summation $5+55+555+\ldots$

In a triangle $ABC$, if $\sin A$, $\sin B$ and $\sin C$ form an A.P, prove that $\cot (A/2)\cot(C/2) = 3$.

Pre-calculus- Finding the sum of $1.2+2.3x+3.4x^2...$ where $|x|<1$

Arithmetic Series: find the sum of 25 terms given 2 terms and their values

How many squares can form an arithmetic progression?

Solving $\left(1+3+5...+(2n+1)\right ) + \left(3.5+5+6.5+...+(\frac{7+3n}{2})\right)=105$

An interesting problem on arithmetic progression and maxima-minima

Find the value of $\sum_{p=0}^{\infty}\sum_{q=0}^{\infty} \frac{2^{-p-q}}{1+p+q}$

How does one evaluate $1+2-3-4+5+6-7-8+\cdots+50$?

Finding how many unit triangles in 10 rows?

How can I get the first element in this sequence?

Summation with variables

Sequences and series help. Finding the first term and the common difference.

Find value of $a_{2012}$

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