how many 3 digit number are divisible by 7
Answers
Answered by
17
first 3 digit no. divisible by 7= 105
last 3 digit no. divisible by 7= 994
In an A.P., an=a+(n-1)d
Here, an= 994
a= 105
d= 7
and we have to find n
so,
994=105+(n-1)7
889=7(n-1)
127=n-1
n=128
Therefore, 128 3-digit no.s are divisible by 7.
last 3 digit no. divisible by 7= 994
In an A.P., an=a+(n-1)d
Here, an= 994
a= 105
d= 7
and we have to find n
so,
994=105+(n-1)7
889=7(n-1)
127=n-1
n=128
Therefore, 128 3-digit no.s are divisible by 7.
Similar questions