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Question 8
Let S(n) represents the sum of digits of a natural number n. For example, S(128)= 1 + 2 + 8 = 11. What is the value of $$S(2^{6} \times 3^{4} \times 5^{5}$$)?
Solution
$$2^6\times3^4\times5^5=\left(2\times5\right)^5\times2\times3^4$$ =Â $$16200000$$
S($$2^6\times3^4\times5^5$$) = S(16200000) = 9
The answer is option A.
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