Question

Find the sum of integers from 1 to 200 which are divisible by 2 or 5 but not by both.

Answer 1

Answer:

Explanation:

The sum of n consecutive terms of any arithmetic sequence is n times the average term, which is the same as the average of the first and last term.

So the sum of the integers from 1 to 200 is:

200⋅1+2002=20100

The sum of the integers: 5,10,15,...,200 is:

(2005)⋅5+2002=4100

So the sum of the integers from 1 to 200 which are not divisible by 5 is:

20100−4100=16000

Step-by-step explanation:

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