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 







57.
1   1  +  1   2  +  1   3  + ... up to n terms = ?  
n  n  n 
Answer: Option
Explanation:
Given sum 







58.
On dividing 2272 as well as 875 by 3digit 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 3digit 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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