Find the sum of all natural numbers between a and 100, which are divisible by 3.
a = 3, l = 99, n = 33
S33= 
(a + l)
= 
(3 + 99)
= 
(102)
= 33 (51) = 1683
11
Find the sum of all natural numbers between a and 100, which are divisible by 3.
a = 3, l = 99, n = 33
S33= (a + l)
= (3 + 99)
= (102)
= 33 (51) = 1683