Question

Add to the difference of 1 and 25​

Answer 1

Answer:

the difference of 1 and 25 is equal to 24

the sum of (1 and 25)+24 is equal to 26+24is equal to 40

Answer 2

Answer:

Hint:-

In this problem, we have to find the sum of counting numbers from 1 to 25 inclusive. We can first write the series from 1 to 25 in ascending and descending order. We can then pair the term in ascending and descending order and obtain their sum.We can multiply the number of pairs and the sum of the pairs and we can divide it by 2 as we have doubled the sum required to get the answer.

Step-by-step explanation:

We know that we have to find the sum of counting numbers from 1 to 25 inclusive.

We can write the series from 1 to 25 in ascending and descending order.

Ascending order

⇒1+2+3+4+5+........+21+22+23+24+25

Descending order

⇒25+24+23+22+21+........+5+4+3+2+1

We can see that, if we pair it off and add, we get the same sum, i.e. 26.

We can also see that there are 25 pairs, but we have doubled the sum required, so we can add the number of pairs and sum of the pairs and divide it by 2, we get

⇒Sum=25×262=325

Therefore, the sum of counting numbers from 1 to 25 inclusive is 325.

mallu right?