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ITMC 2018 Grade 11 National Preliminary set01 Question 27

ITMC · ITMC 2018 Grade 11 National Preliminary set01

Question 27

If the answer is not an integer, give the nearest integer. If the calculated answer has more than five digits, give its last five digits.

Positive integer $k$ makes $6^{2561}+k$ divisible by 100. Find the smallest possible $k$.