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Q.

The smallest composite number is 


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a

2

b

4

c

1

d

None of these 

answer is B.

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Detailed Solution

By definition of a composite number, It is a number that has other divisors besides 1 and the number itself. here,'1 ' is not a composite number because its divisor is one.
 '2' is also not a composite number because it has only two divisors 1 and the number 2 itself but 4 is different.
 Its divisors are 1,2 and 4. So, this number satisfies the criterion of a composite number as stated above, Since besides 1, 2 is also a divisor of 4. So the answer is 4
Hence option 2 is the correct answer.
 
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The smallest composite number is