Math miscellaneousHard

Question

The sum of integers from 1 to 100 that are divisible by 2 or 5 is

Options

A.3000
B.3050
C.3600
D.3250

Solution

Required sum = ( 2 + 4 + 6 + ...... + 100) + ( 5 + 10 + 15 + ..... + 100) - (10 + 20 + ..... + 100)
= 2550 + 1050 - 530 = 3050

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