3, 9, 15, 21, 27
38
LCM of 4,7,14 is 28 So question boils down to multiples of 28 between 61 and 107 Multiples of 28 are 28, 58, 84, 112, 140, ... So the answer is just 84.
The multiples of 7 between 25 and 60 are: 28, 35, 42, 49, 56.
21 and 28 are the two multiples.
21, 28, 35, 42, 49, 56.
Start out looking at them. 7x1=7 odd 7x2=14 even 7x3=21 odd 7x4=28 even 7x5=35 odd 7x6=42 even... so it looks like half might be even and half odd, This is because if we look at the numbers 1-14, ie 1,2,3,4,5,6,7,8,9,10,11,12,13. and 14, they alternate odd and even and since 7 is odd and odd times an even is always an even number and an odd times an odd is always an odd number. So to answer the question we need only look at the number of odd numbers between 1 and 14 inclusive. There are 6 so 1,3,5,7,9,11,13 give odd multiples ANSWER: so 7 odd multiples of 7 between 1 and 100
Multiples of 28
-2
38
The prime numbers between 13 and 28 are 13 17 19 23 Multiples of 7 in that range include 14, 21 and 28.
The sum of all the odd numbers between 1 and 30 (2-28) is 784. If you include 30 the result is 900.
The multiples of 4 between 20 and 40 are 24, 28, 32, and 36.
28, 56, 84 and so on.
LCM of 4,7,14 is 28 So question boils down to multiples of 28 between 61 and 107 Multiples of 28 are 28, 58, 84, 112, 140, ... So the answer is just 84.
They are any five multiples of 28.
All multiples of 28, which are infinite.
There are no multiples of both 28 and 16 that fall between 55 and 101.