Think about the 25 times table.
Find the factors of the given pairs.
Try to divide 86 by all the given options
Think about the sum of the factors of 6.
Think of the definition of prime numbers.
from the given options think about the numbers which only comes in the times table of 1 and itself.
Think about the concepts of prime, perfect and composite numbers.
Think of your 100 times table.
Try to recall the concept of perfect numbers.
Take any composite number and then think about different times table in which it would come.
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