Question

find the sum of all natural numbers in between 200 and 300 which are divisible by 3 and 4

Answer 1

Numbers between 200 and 300 that are divisible by 3 and 4 are

224, 236, 248, 260, 272, 284, 296

Sum = 1820

Answer 2

for this question you have to do manual work...
find numbers divisible by 3 and 4 then add...
there is no short trick.