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Yanjan. Kaf.

Member for 4 years, 9 months
Last seen more than a week ago

Summary

Reputation

300

300
199
99

2021
2022
2023
2024

Top tag

algebra-precalculus

Next privilege

500 Rep.

Access review queues

Badges

1

14

Newest

Peer Pressure

Next badge

6/30

Inquisitive

Impact

~2k

people reached

1

helpful flag

55

votes cast

Questions

View all 11 questions

4

How we come up with the $(n-r+1)$ part in permutation formula.

Jul 19, 2023

3

for $x \in \mathbb{R}$ find the number of solutions in $3x^2 + 4|x^2 - 1| + x - 1 = 0$. Why we are considering negative values here?

Jul 23, 2023

3

why do we put equal to zero when trying to solve the polynomial inequality?

Jul 29, 2023

3

How can we prove that a number is not happy number?

May 10

1

does sign of a rational or polynomial equations remains the same for entire interval?

Jul 30, 2023

Answers

View all 8 answers

2

why do we put equal to zero when trying to solve the polynomial inequality?

Jul 29, 2023

1

How we come up with the $(n-r+1)$ part in permutation formula.

Jul 19, 2023

0

Prove that if $A\subseteq B\setminus C$ then A and C are disjoint.

Jul 25, 2023

0

Proving $(A \cup B) \setminus (A \cap B) = (A \setminus B) \cup (B \setminus A)$

Jul 18, 2023

0

Logarithm proof problem: $a^{\log_b c} = c^{\log_b a}$

Aug 15, 2023

Tags

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algebra-precalculus

2

Score

7

posts

inequality

2

Score

3

posts

polynomials

2

Score

2

posts

combinatorics

1

Score

3

posts

discrete-mathematics

0

Score

4

posts

Reputation

+30

How can we prove that a number is not happy number?

+10

How we come up with the $(n-r+1)$ part in permutation formula.

-2

why is the co-prime part not mentioned in the definition of the rational number?

-2

Counting the numbers of quantifiers, how are there 4?

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1

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Yearling

Jul 29, 2023

14

bronze badges

Excavator

Jul 23, 2023
Citizen Patrol

Apr 12, 2023
Peer Pressure

Sep 1

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Votes cast

53

upvotes

2

downvotes

13

question votes

42

answer votes

1

this month