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Natni
Questions and answers by visitors named
Natni
Questions (8)
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
5 answers
2,079 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
3 answers
539 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
5 answers
432 views
Divide some peanuts into three groups and one peanut is outstanding. Mix two groups thereof with the outstanding peanut and
1 answer
368 views
Divide some peanuts into three groups and one peanut is outstanding. Mix two groups thereof with the outstanding peanut and
1 answer
410 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
3 answers
447 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 answer
477 views
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 answer
379 views
Answers (3)
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🙏
