Aptitude - Numbers
Exercise : Numbers - General Questions
- Numbers - Formulas
- Numbers - General Questions
56.
9 + | 3 | + 7 + | 2 | - | ![]() |
9 + | 1 | ![]() |
= ? |
4 | 17 | 15 |
Answer: Option
Explanation:
Given sum |
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57.
![]() |
1 - | 1 | ![]() |
+ | ![]() |
1 - | 2 | ![]() |
+ | ![]() |
1 - | 3 | ![]() |
+ ... up to n terms = ? |
n | n | n |
Answer: Option
Explanation:
Given sum |
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58.
On dividing 2272 as well as 875 by 3-digit number N, we get the same remainder. The sum of the digits of N is:
Answer: Option
Explanation:
Clearly, (2272 - 875) = 1397, is exactly divisible by N.
Now, 1397 = 11 x 127
The required 3-digit number is 127, the sum of whose digits is 10.
59.
A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 9 are wrong and the other digits are correct, then the correct answer would be:
Answer: Option
Explanation:
987 = 3 x 7 x 47
So, the required number must be divisible by each one of 3, 7, 47
553681 (Sum of digits = 28, not divisible by 3)
555181 (Sum of digits = 25, not divisible by 3)
555681 is divisible by 3, 7, 47.
60.
How many prime numbers are less than 50 ?
Answer: Option
Explanation:
Prime numbers less than 50 are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
Their number is 15
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