Question

Find the sum of series $20^2 -19^2 + 18^2 - 17^2 +16^2 -15^2 +...+ 2^2 -1^2$?

score 1k · Answer 1 · 2020-02-03 15:28:24

1k

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Find the sum of series $20^2 -19^2 + 18^2 - 17^2 +16^2 -15^2 +...+ 2^2 -1^2$?

Published on 03 Feb 2020 - 15:28

score 104 · Answer 2 · 2026-03-27 02:39:14

104

Views

At most how many $k$-APs in $[n]$ contains a fixed number?

Published on 27 Mar 2026 - 2:39

score 30 · Answer 3 · 2020-02-05 01:59:37

30

Views

Sum of Completion Times

Published on 05 Feb 2020 - 1:59

score 40 · Answer 4 · 2020-02-05 04:39:45

40

Views

Total Completion Time using Shortest Job First

Published on 05 Feb 2020 - 4:39

score 201 · Answer 5 · 2020-02-06 07:32:04

201

Views

Powers modulo higher residues

Published on 06 Feb 2020 - 7:32

score 1.6k · Answer 6 · 2020-02-06 13:45:28

1.6k

Views

Return number if positive and zero if negative

Published on 06 Feb 2020 - 13:45

score 20 · Answer 7 · 2026-03-27 19:30:24

20

Views

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score 67 · Answer 8 · 2020-02-08 06:18:02

67

Views

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120

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score 56 · Answer 10 · 2026-03-30 22:59:31

56

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score 155 · Answer 11 · 2020-02-10 20:57:39

155

Views

Let $\omega_n=e^{2\pi i/n}$. Prove $1+\omega_n+\omega^2_n+\cdots+\omega^{n-1}_n=0.$

Published on 10 Feb 2020 - 20:57

score 29 · Answer 12 · 2020-02-12 16:05:00

29

Views

simple inequality question involving positive integers

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score 49 · Answer 13 · 2020-02-13 09:24:41

49

Views

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Published on 13 Feb 2020 - 9:24

score 107 · Answer 14 · 2020-02-13 12:25:17

107

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2 runners run on a oval track, both are at constant speed

Published on 13 Feb 2020 - 12:25

score 16 · Answer 15 · 2026-03-27 21:19:34

16

Views

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Published on 27 Mar 2026 - 21:19

List Question

Find the sum of series $20^2 -19^2 + 18^2 - 17^2 +16^2 -15^2 +...+ 2^2 -1^2$?

At most how many $k$-APs in $[n]$ contains a fixed number?

Sum of Completion Times

Total Completion Time using Shortest Job First

Powers modulo higher residues

Return number if positive and zero if negative

Is this percent change question right?

Calculate just the digits in product of two numbers

Solving a system of equations using both arithmetic and bitwise operations

Solution of square root of the square of (-1)

Let $\omega_n=e^{2\pi i/n}$. Prove $1+\omega_n+\omega^2_n+\cdots+\omega^{n-1}_n=0.$

simple inequality question involving positive integers

All different notations of an arithmetic expression?

2 runners run on a oval track, both are at constant speed

How percentages on an individual change with respect to being applied to the group

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