model 1 basic number system Section-Wise Topic Notes With Detailed Explanation And Example Questions

MOST IMPORTANT quantitative aptitude - 6 EXERCISES

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The following question based on number system topic of quantitative aptitude

Questions : Which of the following is always odd?

(a) Sum of two odd numbers

(b) Difference of two odd numbers

(c) Product of two odd numbers

(d) None of these

The correct answers to the above question in:

Answer: (c)

Option a) 1 + 3 = 4, 3 + 5 = 8

Option b) 1 - 3 = 2, 3 - 5 = 2

Option c)  1 x 3 = 3,  3 x 5 = 15

∴ Option (C) is Correct.

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Read more basic number system Based Quantitative Aptitude Questions and Answers

Question : 1

If (n - 1) is an odd number, what are the two other odd numbers nearest to it?

a) n, n-1

b) n, n-2

c) n - 3, n + 1

d) n - 3, n + 5

Answer: (c)

(n – 1) is odd

⇒ (n – 1) – 2 & (n – 1) + 2 are odd.

⇒ (n – 3) and (n + 1) are odd.

Question : 2

For the integer n, if $n^3$ is odd, then which of the following statements are true? I. n is odd. II. $n^2$ is odd. III. $n^2$ is even

a) I only

b) II only

c) I and II only

d) I and III only

Answer: (c)

If n3 is odd

⇒ n is odd and n2 is odd

For example

$n^3$ = 27. Then n = 3 & $n^2$ = 9

∴ I and II are true.

Question : 3

If n and p are both odd numbers, which of the following is an even number?

a) n + p

b) n + p + 1

c) np + 2

d) np

Answer: (a)

Let for example:

n=3 p=5

Option a) 3 + 5 = 8 (even number)

Option b) 3 + 5 + 1 = 9 (odd number)

Option c) 3 x 5 + 2 = 17 (odd number)

Option d) 3 x 5  = 3  (odd number)

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GET number system PRACTICE TEST EXERCISES

model 1 basic number system

model 2 divisibility, multiples, add and subtract based number system

model 3 fraction of numbers

model 4 finding unit place of a number

model 5 smallest and largest fraction/numbers

model 6 operations of consecutive numbers (odd, even, square, etc.)
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