Q1 of 202 Page 10

Define an arithmetic progression.

An arithmetic progression is a list of numbers in which each term is obtained by adding a fixed number to the preceding term except the first term. This fixed number is called the common difference of the AP.


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65

If the sum of first n terms of an A.P. is (3n2 + 7n), then find its nth term. Hence write its 20th term.

 66

The sum of first 9 terms of an A.P. is 162. The ratio of its 6th term to its 13th term is 1:2. Find the first and 15th term of the A.P.

 2

Write the common difference of an A.P. whose nth term is an = 3n + 7.

 3

Which tem of the sequence 114, 109, 104, .... is the first negative term?