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I.S.I. and C.M.I. Entrance

TOMATO Objective 94 | ISI Entrance Problem

This is a problem from TOMATO Objective 94 based on number of divisors. This problem is helpful for ISI Entrance Exam. Try out the problem. (By Akash Singha Roy)

Problem: TOMATO Objective 94

Number of divisors of 2700

Solution:

2700 = 2^2 \times 3^3\times 5^2

Hence, any divisor of 2700 must be of the form 2^{a_1} \times 3^{a_2} \times 5^{a_3} where 0<=a_1<=2, 0<=a_2<=3, 0<=a_3<=2

Therefore, by the Multiplication Principle of Counting, the number of divisors of 2700 = (2+1) \times (3+1)\times (2+1) = 36

 

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By Dr. Ashani Dasgupta

Ph.D. in Mathematics, University of Wisconsin, Milwaukee, United States.

Research Interest: Geometric Group Theory, Relatively Hyperbolic Groups.

Founder, Cheenta

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