Question

how many multiples of 5 lies between 10 and 1000 ?​

Answer 1

For this,

1000 - 10 = 990

Now,

990/5 = 198

So, there are total 198 multiples of 5 between 10 and 100

Answer 2

Answer:

AP:-10, 15, 20,......,1000

a=10, An=1000, d=15-10=5

An=a+(n-1)d

1000=10+(n-1)5

1000=10+5n-5

1000=10-5+5n

1000=5+5n

5n=1000-5

5n=995

n=995/5

n=199

Therefore, 199 multiples of 5 lies between 10 and 1000.