Question

Numbers between 600 to 1000 divisible by 7 and 9

Answer 1

L.C.M. of 7 and 9 is 63

The numbers which are multiple of 63 will be divided by both 7 and 9.

Multiple of 63 are
630, 693.............. 945
This is an AP.

n = (l-a/d) +1

= ((945 - 630)/63) + 1

= (315/63) +1

= 5 +1 = 6

There are 6 numbers which are divisible by 7 and 9

I hope this answer help you

Answer 2

Solution :-

First, we have to find the LCM of 7 and 9

7 = 7*1

9 = 3*3*1

LCM of 7 and 9 = 7*3*3

= 63

So, all the multiples of 63 between 600 to 1000 are divisible by 7 and 9.

Multiples of 63 between 600 to 1000 are as follows.

1) 630

2) 693

3) 756

4) 819

5) 882

6) 945

So, there are 6 numbers between 600 to 1000 divisible by 7 and 9.

Answer.