mathematics topics for competitive exams

 Q1If A is 28% more than B and C is 25% less than the sum of A and B, then by what percent will C be  more than A (correct to one decimal place)? (a) 32.2% (b) 28% (c) 43% (d) 33.6% 2) If the radius of a right circular cylinder is  decreased by 20% while its height is increased by  40%, then the percentage change in its volume  will be? (a) 1.04% increase (b)10.4% decrease (c) No increase or decrease  (d) 10.4% increase   3) Raghav spends 80% of his income. If his income  increases by 12% and the savings decrease by 10%,  then what will be the percentage increase in his  expenditure?   (a) 20.5 (b) 16 (c) 17.5 (d) 22

 Hello student , Good morning to all of you . I hope you are well and healthy  Today we read 20 most important Number system  question with best short trick . Let's Start.......💫💫⭐⭐ If you want to read in hindi translate this Page . Translation baar is given at right top corner .✅✅✅  Question:1⭐⭐⭐⭐⭐⭐⭐⭐⭐ Solve this  √3×√27= ? Answer: =√3×√27=√81=9 Note: you should  remember that 1. √a×√b = √ab⭐ 2.√(-a)×√b= -√ab=√a×√(-b) 3.√(-a) × √(-b)= -√ab  On this basics solve these type questions   Question 2. (√-3)×(√-27) =? Answer: Now we solve this question  =(√-3)×(√-27)= √(-3)×√(-3)×√(-3)×√(-3)= (-9) Very important question  Such type answer will be only use (-) sign    Divisibility rules 

  Hello guys, Welcome to all on my blog . I hope you are well and healthy. Today we teach all important math formulas  Which is used  in Mostly mathematics  Question. Here is list of mathematics formulae:✅✅ Content list:- Algebra formula Trigonometry formula                            Algebra                  1. (a²-b²) = (a + b)(a - b) 2. (a4- b4) = (a² + b²)(a² - b²) = (a² + b²)(a + b)(a - b) .3 (a + b + c)² = a² + b² + c² + 2(ab + bc + ca) 4.(a³-b³)= (a-b) (a²+ab+b²) 5. (a⁴-b⁴)=(a²+ b²+ ab)(a²+b²-ab)  1. (a + b)² a² + 2ab + b² 2. (a - b)² = a² - 2ab + b² Note: √a² - 2ab + b² when b > a. = (a - b) when a > band (b - a) 3. (a + b)² = (a - b)² + 4ab 4. (a - b)² = (a + b)²-4ab 5. (a + b)² + (a - b)² = 2(a² + b²) 6. (a + b)²-(a - b)² = 4ab 7. [(a+b)² + (a−b)²]/a²+b² = 2 8. [(a+b)²-(a−b)² ]/ ab = 4 9. (a + b)³ = a³ + b³ + 3ab(a + b) 10. (a - b)³ ...