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Natni

Questions (8)

Amy does some special operations when she sums up numbers. If the answer is greater than 100, she will subtract 10 from it; if
1. 1 answer
2. 453 views
Numbers are drawn from the 27 integers 1 to 27. At least how many number(s) is / are drawn at random to ensure that there are
1. 2 answers
2. 2,209 views
Write five-digits numbers at random but written numbers are not to be written again. How many times of writing at least can
1. 0 answers
2. 557 views
If digits are not to be used with repetition, find the number of four- digit odd numbers divisible by 15 which can be formed by
1. 2 answers
2. 537 views
Divide some peanuts into three groups and one peanut is outstanding. Mix two groups thereof with the outstanding peanut and
1. 0 answers
2. 478 views
Divide some peanuts into three groups and one peanut is outstanding. Mix two groups thereof with the outstanding peanut and
1. 0 answers
2. 432 views
How many different values can be formed by using only four 50-cent coins, four 1-dollar coins, four 2-dollar coins and four
1. 4 answers
2. 498 views
The average scores of the last four tests taken by Mike is 86 marks. To raise the scores to 92 marks, at least how many times
1. 2 answers
2. 605 views

You can use combination. There are 6 digits: 3, 8, 1, 2, 5, 7 So the combination digits will be: 6*5*4*3*2 = 720
I still don't understand🙏 why must sum to 10 or 13 or 16 etc.? Can we use combination to solve it?
Thanks a lot, it helps me a lot🙏

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