on writing all factors and caring up which among the following has four pairs of factors- 15 , 24 , 36 , 68
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Answer:
The correct answer is 15.
It's factors are 1,3,5,15.
Step-by-step explanation:
The no.of factors of any number,N is (a+1)(b+1)(c+1).
Where a,b,c are exponents of N expressed in prime numbers.
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