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Let  be the number obtained by writing the integers 1 to  from left to right. Therefore,  andFor , how many  are divisible by 9?

 Nov 23, 2022
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Let \(a_n\) be the number obtained by writing the integers 1 to \(n\) from left to right. Therefore, \(a_4 = 1234\) and\(a_12 = 123456789101112\)For \(1 \le k \le 100\), how many\(a_k\)  are divisible by 9?

 

THIS IS THE REAL QUESTION SORRY

 Nov 23, 2022

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