Fewpal
0 votes
5.2k views
in Mathematics by (127k points)
edited by
Determine the AP whose third term is 16 and the 7th term exceeds the 5th term by 12.

1 Answer

+1 vote
by (25.3k points)
selected by
 
Best answer

Solution:

We have given a3 = 16

a + (3 − 1) d = 16

a + 2d = 16 (1)

a7 − a5 = 12

[a+ (7 − 1) d] − [+ (5 − 1) d]= 12

(a + 6d) − (a + 4d) = 12

2d = 12

d = 6

From equation (1), we obtain

a + 2 (6) = 16

a + 12 = 16

a = 4

Therefore, A.P. will be

4, 10, 16, 22, …

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...