## Bharat Gupta is teaching live on Unacademy Plus

SEQUENCE AND SERIES Class -I (Arithmetic Progression)

ARITHMETIC PROGRESSION A sequence whose terms increase or decrease by a fixed number is called an arithmetic progression. The fixed number is called the common difference of the A. P. In an A. P, we usually denote the first term by a, the common difference by d and the nth term by tn. oe, 4 , 13 - r ena m-2

nth term of an Arithmetic Progression d. 2 a Point to remember

Sum of n term of an Arithmetic Progression d. 2 a

Sum of n term of an Arithmetic Progression d. 2 a ola

Properties of Arithmetic Progression LM A

Properties of Arithmetic Progression , aa -- n and b bn

Properties of Arithmetic Progression 3, 11, IS, 19, 23, 27, , 3S, 39, 43 , 43' SI

If the pth term of an A. P. is q and the qth term is p, then its (p+q)th term is a. O b. p q c. p+q d. none of these

If the pth term of an A. P. is q and the qth term is p, then its (p+q)th term is a. O b. p q c. p+q d. none of these he d -J

The number of numbers lying between 100 and 500 that are divisible by 7 but not by 21 is a. 57 b. 19 . 38 d. none of these