Question

4. How many three-digit numbers are there
divisible by 3? Find their sum.​

Answer 1

Answer:

There are many numbers..

But they should have the last digit as 3,6,9and in some cases 2,5,8,1,4,7 ...

In short remember the table of 3

Step-by-step explanation:

1. 333

2. 666

3. 999

4. 123

5. 264

Answer 2

Let the three digit numbers divisible by 3 102,105,108....,999

a=102,d=3.tn =999.

999=102+n-1×3.

n-1×3 =999-102

n-1=299

n=300

Sn=300

S300=300/2(2a+n-1×d)

S300=150(204+299×3)

S300=150×1101

S300=165150