Question

Which number is the odd one out? 9678, 4572, 5261, 5133, 3527, 6895,7768

Answer 1

The number which is the odd one is 3527

Explanation:

The numbers that are given are 9678,4572,5261,5133,3527,6895,7768

We will sum the digits of the given number first:

$9678=9+6+7+8=30\\4572=4+5+7+2=18\\5261=5+2+6+1=14\\5133=5+1+3+3=12\\3527=3+5+2+7=17\\6895=6+8+9+5=28\\7768=7+7+6+8=28$

Now, if we look at the sum of the digits of the given number, all the numbers are even number that is divisible by 2,

Only 17  is a odd number as well as a prime number.

Thus we can conclude that 3527 is the odd one among the given numbers.

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Answer 2

Odd one out:

Explanation:

From the given question,

The odd number from the given number is - 3527, as it is not divisible by 3 , rest other numbers are divisible by 3.

The divisibility for the number can be checked , by adding all the digits of the number , then , if getting the result which is divisible by 3 , will make the number divisible by 3.

for example,

9678 = 9+6+7+8 = 30 , as 30 is divisible by 3 , hence , the number 9678 too is also divisible by 3.

And ,

3527 = 3+5+2+7 = 14 , is not divisible by 3, hence, 3527 is also not divisible by 3.        

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