MATHS MAGIC

General term of an A.P.

• a_n = a+(n-2)d

• a_n = 2a+(n-1)d

• a_n = a+(n-1)d

• a_n = a+(2n-1)d

Sum of n terms in AP

• n[2a +(n-1)d]

Sum of natural numbers

• non of these

Sum of squares of n natural number

• n(n+1)(2n+1)/6
• n(n+1)/2
• n^2+n
• n^3+n^2

Sum of cube of n natural numbers

• n(n+1)/2
• non of these

If first term and last term of an A.P. are given then sum of nth term of an A.P. will be

• n/2 * (first term + last term)
• n * (first term + last term)
• n/2 * (first term - last term)
• n * (first term - last term)

How to calculate discriminant in quadratic equation ?

• Add the square of the coefficient of x to 4 times the product of the coefficients of x and the constant term
• Subtract the square of the coefficient of x squared from 4 times the product of the coefficients of x and the constant term

Who is the father of mathematics ?

• Aristotle
• Archimedes

• Pythagoras
• Plato

For a linear pair equation in two variables, what conditions for infinitely solutions?

• The coefficients of the variables are equal
• The constant terms are equal
• Both the coefficients of the variables and the constant terms are equal
• The coefficients of the variables are proportional and the constant terms are also proportional

Who invented Zero?

• Albert Einstein
• Isaac Newton
• Aryabhata
• Galileo Galilei