0 reads0 ratings0 helpful
If (a_n=an+b), (a_4+a_8=74), and (a_5+a_9=86), what will be (a_1)?
Advertisement
Answer and explanation
Correct answer: (1)
Subtracting the two sums gives (2a=12), so (a=6). Then (12a+2b=74) gives (b=1), so (a_1=a+b=7).
Frequently asked questions
What is the correct answer to this question?
(1)
Why is this the correct answer?
Subtracting the two sums gives (2a=12), so (a=6). Then (12a+2b=74) gives (b=1), so (a_1=a+b=7).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: nth term.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement