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**⇒ Arithmetic Progression:** A sequence of numbers in which the successive terms increase or decrease by a constant number is called an “Arithmetic Progression (AP)”**⇒ Common Difference:** The constant difference between two consecutive terms of an AP is called “Common Difference”.**⇒ General Form of an AP:** If the first term is ‘a’ and common difference is ‘d’, then a, a + d, a + 2d, a + 3d,... represent the arithmetic progression for different values of ‘a’ and ‘d’. This is called** “General Form of an AP”** **⇒** **n ^{th} term of an A.P.:** The n

a

where a = First term of an AP

l = Last term of an AP = a + (n-1) d

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