Question

I need answers as soon as possible

1.There is a number 61 on a whiteboard. Every minute a number is erased and another number is written instead: a product (multiplication) of digits of an old number plus 13. What number will be written on a whiteboard in one hour? (the answer is a number) For example, after the first minute on a whiteboard will be a number 19 = 1* 6 + 13.

2.There are 5 members of a sports team. There need to be a captain and a deputy. How many ways are there to select a captain and a deputy? (the answer is a number)


3.There are lotuses growing in the mountain lake in Peru. Every day, each lotus is split in half, and instead of one lotus, two appear. The next day, each of the resulting lotuses is split in half, and so on. After 30 days, the lake was completely covered with lotuses. After how many days the half of the lake was covered with lotuses? (the answer is a number)

Answer 1

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