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Meaning and Basics of Arithmetic Progression, Derivation for n^{th} term (General term) of Arithmetic Progression, Derivation for Sum to n terms of a Arithmetic Progression, Relationship between Arithmetic Progression and Arithmetic Mean

NCERT EXERCISE 9.2 |

**Question 1.** Find the sum of odd integers from 1 to 2001.

**Question 2.** Find the sum of all natural numbers lying between 100 and 1000, which are multiples of 5.

**Question 3.** In an A.P., the first term is 2 and the sum of the first five terms is one-fourth of the next five terms. Show that 20^{th} term is –112.

**Question 4.** How many terms of the A.P. -6, -\frac{11}{2}, -5, … are needed to give the sum –25?