Question 22
Write the correct answer from the given four options.
If m is the cube root of n, then n is
a) m3 b) √m c) m3 d) 3√m
Given, m is the cube root of n, i.e. m=3√n ⇒m=(n)13 ⇒m3=(n)33 [taking cube on both sides] ∴m3=n
Question 20
If m is the square of a natural number n, then n is
a) The square of m b) Greater than m c) Equal to m d) √m
Question 12
The sum of first n odd natural numbers is
a) 2n+1 b) n2 c) n2−1 d) n2+1
Question 11
The sum of successive odd numbers 1, 3, 5, 7, 9, 11, 13 and 15 is
a) 81 b) 64 c) 49 d) 36
Question 15
Out of the four options, only one is correct. Write the correct answer.
The expression for the number of diagonals that we can make from one vertex of a n-sided polygon is (a) 2n+1 (b) n-2 (c) 5n+2 (d) n-3