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Alex17521 [72]
3 years ago
10

How many number are their between 4,000 and 10,000 such that each digit in number is larger than digit on its left but its small

er than digit on its right?
Sample 4569
How many number?
Mathematics
1 answer:
attashe74 [19]3 years ago
4 0

Answer:

Total of 14

Step-by-step explanation:

so you want numbers like 4567 (smallest)

through 6789 (largest)?

4567, 4568, 4569

4578, 4579

4589

4678. 4679,

4789

5678, 5679

5689

5789

6789

Hope I was able to help!!

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Mei Su had 80 coins. She gave most of them to her friends in such a way that each of her friends got at least one coin and no tw
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Answer: 12 friends.

Step-by-step explanation:

the data we have is:

Mei Su had 80 coins.

She gave the coins to her friends, in such a way that every friend got a different number of coins, then we have that:

The maximum number of friends that could have coins is when:

friend 1 got 1 coin

friend 2 got 2 coins

friend 3 got 3 coins

friend N got N coins

in such a way that:

(1 + 2 + 3 + ... + N) ≥ 79

I use 79 because "she gave most of the coins", not all.

We want to find the maximum possible N.

Then let's calculate:

1 + 2 + 3 + 4 + 5 = 15

15 + 6 + 7 + 8 + 9 + 10 = 55

now we are close, lets add by one number:

55 + 11 = 66

66 + 12 = 78

now, we can not add more because we will have a number larger than 80.

Then we have N = 12

This means that the maximum number of friends is 12.

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Answer:

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