Need help please!!
1.How many ways can 6 runners be arranged on a running track that has 8 lanes (assume one runner per lane allowed only)
2.100g substance is left to evapourate. Each day it loses one-tenth of its weight at the beginning of the day. How many days elapse before it is less than half its original mass?
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Assuming only one runner is allowed per lane, six runners can be arranged on a running track that has 8 lanes in `^8C_6` ways.
Therefore, the required number of ways = `^8C_6`
Hence, six runners can be arranged on a running track that has 8 lanes in 28 ways.
As for the second question, post it in a separate question.
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