# CBSE Class 10-Mathematics: Chapter –5 Arithmetic Progressions Part 23

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**Question 19:**

If term of an A.P is twice the term, show that term is twice the term.

**Answer:**

**Question 20:**

The sum of four numbers in AP is and the greatest number four times the least. Find the numbers.

**Answer:**

Let no. be

According to question,

Numbers be

**Question 21:**

Find the sum of all integers between and which are multiples of .

**Answer:**

**Question 22:**

If term of an A.P is and the term is , show that the sum of terms is .

**Answer:**

On solving (i) and (ii)