How many three digit natural number are divisible by 4?

The least 3 digit natural number divisible by 4 is 100 and the largest 3 digit natural number divisible by 4 is 996.
Here , a = 100, d = 4 and tn = 996
We know that,
tn  = a + (n – 1 ) d
996 = 100 + (n – 1 )4
∴ 996 – 100 = 4 (n – 1)
∴ 896/4 = n – 1
∴ 224 = n – 1
∴ 224  + 1 = n
∴ n = 225

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