EASY
CAT
IMPORTANT
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The highest common factor of two natural numbers a and b is 10, while their lowest common multiple of is 45. If a=15, then what is the value of b?

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Important Questions on Number Systems

EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 149
The respective LCM and HCF of 10! and 15! are _____.
MEDIUM
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 150
The remainder obtained when 18116! is divided by 19 is _____.
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CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 151
Given that 7x+y is a prime number for natural number x+y, then what is the minimum value of (x+y)?
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CAT
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How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 152
If n is an odd digit then unit's digit of the product 171n × 1414 × 729 × 2015 will be:
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CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 153
If unit's digit of the product 171n × 1413 × 729 × 2015 is 0 then, maximum number of values that n may take?
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IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 154
The first two, 2 digit numbers that divide (2112346-1) are?
HARD
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 155

What is the unit's digit of 1!+2!+3!+4!+..........+1000!?

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CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 1 - Number Systems>Level of Difficulty>Q 156

How many zeroes are there at the end of (34!)(6!)?