Question

the sum of all natural number between 1 and hundred which are divisible by 2 or 5​

Answer 1

Answer:

3050

Step-by-step explanation:

2 will divide the numbers:

2, 4, 6, 8, 10, 12…98, 100

it will cover the multiples of 10 which will also be divisible by 5.

so for 5 the remaining divisible numbers are:

5, 15, 25, …85, 95

both the sequences are A.P whose sum are = 50/2(2 + 100) = 2550 and 10/2(5 + 95) = 500 so total sum is 3050