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Arithmetic Progressions

Question
CBSEENMA10007430

Which of the following are APs ? If they form an AP, find the common difference d and write three more terms.

2 comma space 5 over 2 comma space 3 comma space 7 over 2 comma....

Solution
2 comma space 5 over 2 comma space 3 comma space 7 over 2 comma....
a2 - a5 over 2 minus 2 equals 1 half
a- a3 minus 5 over 2 equals 1 half
a- a7 over 2 minus 3 equals 1 half
i.e., ak+1 – ak is the same every time so, the given list of numbers forms an A .P. with the common
difference d = 1 half.
The next three terms are :
7 over 2 plus 1 half equals 4
4 plus 1 half equals 9 over 2
and space 9 over 2 plus 1 half equals 5