Question

Find the sum of three - digit natural number which are divisible by 4.​

Answer 1

The three digital number which is divisible by 4 is

100,104,108,996

first term=100

d=104−100=4

last term=996

Then,

n=a=(n−1)×4

996=100+(n−1)×4

996−100=(n−1)4

4

896

​  

=(n−1)

224=(n−1)

∴n=225

225 three digits number which is divisible by 4

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