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Q.

The largest odd number that is a factor of 860 is:


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a

  115

b

  143

c

  215

d

  243 

answer is C.

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Detailed Solution

Concept- To solve this question, we will prime factorise the given number in the question statement and then, we will multiply the odd factors to obtain our desired answer as multiplication of odd numbers result in an odd number too.
Given number is 860.
By Prime-factorisation of 860 , we get 860=(2 × 2 × 5 × 43)
Here, of 2,5 and 43 , the odd numbers are 5 and 43 .
The Largest odd factor of 860=(43×5)=215
Hence, the correct answer is option 3.
 
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