| June 24th, 2014 08:38 AM | |
| Rohit Barla | How to Solve Quantitative Aptitude Section Will you please provide me some tips and tricks to solve quantitative aptitude section?? Quantitative Aptitude test has questions on the numerical ability and accuracy level in the mathematical calculations. Here I am giving you some tips and tricks to solve Quantitative Aptitude Questions; -Know well about the types of questions that are covered under this heading - Revise the basics of mathematics -Preparation with good books and papers -Consult with senior students & teachers -Practice hard -Try to solve problems with accuracy Here I am giving you some Short tricks to solve quantitative aptitude problems Formulas of Number Series 1 + 2 + 3 + 4 + 5 + … + n = n(n + 1)/2 (13 + 23 + 33 + ..... + n3) = (n(n + 1)/ 2)2 (12 + 22 + 32 + ..... + n2) = n ( n + 1 ) (2n + 1) / 6 Sum of first n odd numbers = n2 Sum of first n even numbers = n (n + 1) Mathematical Formulas (a + b)(a - b) = (a2 - b2) (a + b)2 = (a2 + b2 + 2ab) (a3 - b3) = (a - b)(a2 + ab + b2) (a3 + b3 + c3 - 3abc) = (a + b + c)(a2 + b2 + c2 - ab - bc - ac) When a + b + c = 0, then a3 + b3 + c3 = 3abc (a + b)n = an + (nC1)an-1b + (nC2)an-2b2 + … + (nCn-1)abn-1 + bn (a - b)2 = (a2 + b2 - 2ab) (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) (a3 + b3) = (a + b)(a2 - ab + b2) Shortcuts for number divisibility check -A number is divisible by 2, if its unit's digit is any of 0, 2, 4, 6, 8. -A number is divisible by 3, if the sum of its digits is divisible by 3. -A number is divisible by 4, if the number formed by the last two digits is divisible by 4. -A number is divisible by 5, if its unit's digit is either 0 or 5. -A number is divisible by 6, if it is divisible by both 2 and 3. -A number is divisible by 12, if it is divisible by both 4 and 3. -A number is divisible by 14, if it is divisible by 2 as well as 7. -Two numbers are said to be co-primes if their H.C.F. is 1. To find if a number, say y is divisible by x, find m and n such that m * n = x and m and n are co-prime numbers. If y is divisible by both m and n then it is divisible by x. -A number is divisible by 8, if the number formed by the last three digits of the given number is divisible by 8. -A number is divisible by 9, if the sum of its digits is divisible by 9. -A number is divisible by 10, if it ends with 0. -A number is divisible by 11, if the difference of the sum of its digits at odd places and the sum of its digits at even places, is either 0 or a number divisible by 11. |
