Question

The sum of the numbers between 1 & 100 which are exactly divisible by 3 or 5 is

Answer 1

this is an que of Ap
for A.P,
Sum of n terms=n/2(2a+(n-1)d)
by this formula
sum of terms divisible by 3=1683
                                         5=1050
                         both 3 and 5=225
final ans 1683+1050-225=2508
Here may be calculatn mistake.but idea is correct.check it out>>>>>