how many numbers are between 1 to 100 which are exactly divisible by eighter 3 or 7
Answers
Answered by
1
If a number is divisible by both 3 and 4, then it is divisible by 3×4=12. Why?
Try dividing 100 by 12 and rounding down: keeping only the integer result, not the remainder. To see how this works, we can simply take multiples of 12:
12,24,36,…,96(the next multiple of 12 takes us over 100). So between 1 and 96, there are9612=8
Try dividing 100 by 12 and rounding down: keeping only the integer result, not the remainder. To see how this works, we can simply take multiples of 12:
12,24,36,…,96(the next multiple of 12 takes us over 100). So between 1 and 96, there are9612=8
Answered by
2
3 × 1 = 3 till 3 × 33 = 99
=> 33 numbers
7 × 1 = 7 till 7 × 14 = 98
=> 14 numbers
But factors of (3 × 7 = 21) will come in both the counting,
21 × 1 = 21 till 21 × 4 = 84
=> 4 numbers
Total = 33 + 14 - 4
= 43
Hope this helps.... plsss make it the brainliest
=> 33 numbers
7 × 1 = 7 till 7 × 14 = 98
=> 14 numbers
But factors of (3 × 7 = 21) will come in both the counting,
21 × 1 = 21 till 21 × 4 = 84
=> 4 numbers
Total = 33 + 14 - 4
= 43
Hope this helps.... plsss make it the brainliest
Similar questions