# DCP-191: Counting Multiples Back to All Problems

Easy Math > Number Theory

Oishi will give you 2 integers N & K. You have to tell her how many N digit counting numbers are divisible by K. Suppose for N = 2 and K = 10 , we see that the 2 digits numbers are from 10 to 99 and only 9 of them is divisible by 10. So the answer is 9. Input: ------ Input starts with an integer **T (1<=1000)**, denoting the number of test cases. Each case contains two integer **N (2 ≤ N ≤ 9)** denoting the number of digits and **K (1 ≤ K ≤ 999999999)** denoting the divisible integer. Output: ------- Output how many counting numbers of digit N is divisible by K. Sample Input ------------ 2 2 10 3 3 Sample Output ------------- 9 300

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