List of top Logical Reasoning Questions on Number Systems

How many 4-digit positive integers divisible by 3 can be formed using only the digits {1, 3, 4, 6, 7}, such that no digit appears more than once in a number?

The sum of the following infinite series is
$2+ \frac{1}2 + \frac{1}3 + \frac{1}4 + \frac{1}8 + \frac{1}9 + \frac{1}{16} + \frac{1}{27}+ .....$

If the given interchanges are made in sign and numbers, which one of the four equations would be-correct?
Interchanges - Signs - and x 
- Numbers 3 and 6 
A. \(6 − 3 × 2 = 9\)
B. \(6 × 3 − 4 = 15\)
C. \(3 × 6 − 4 = 33\)
D. \(3 − 6 × 8 = 10\)
Choose the most appropriate answer from the options given below:

A device classifies numbers according to the following criteria. The number must have
(A) The number has five digits
(B) First and last digits are perfect squares.
(C) The middle digit is an odd number and it is an addition of first and last digits.
(D) Second and fourth digits are the difference between first and third digits, third and fifth digits.
Which of the following number could be correct according to the conditions given above?

Find the next number in the series 7, 9, 14, 27, 28, 81, ?

Find the next number in the series 210, 195, 175, 150, 120, ?

What should come in place of question mark (?) in the following questions?
544.134 + 8.886 − 5.435 × 31.002 = ?

What should come in place of question mark (?) in the following questions?
(7159 + 6382 + 1156) ÷ (543 + 499 + 615) = ?

What should come in place of question mark (?) in the following questions?
(61% of 845) ÷ 723 = ?

What should come in place of question mark (?) in the following questions?
753362 × 61 = ? ≈ 88888

What should come in place of question mark (?) in the following questions?
\(\sqrt{1562000 }\)= ?

Find the wrong term in the following number series: 3, 8, 12, 16, 48, 38, 192, 64