CBSE Class 10-Mathematics: Chapter –5 Arithmetic Progressions Part 4
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Question 17:
If are in AP find
Answer:
are in AP find .
On solving we get
Question 18:
Find the middle term of the AP
Answer:
Middle terms
term is middle term
Question 19:
Find the common difference of an AP whose first term is and sum of whose first terms is times the sum of next terms.
Answer:
APQ
Question 20:
Find the sum of all-natural no. between & which are divisible by . Find their sum.
Answer:
No let and , which are divisible by .
No. which are divisible by are
No. which are divisible by
There are terms between divisible by .
Question 21:
The ratio of the sum of first terms of two AP’s is . Find the ratio of their terms
Answer:
Let be the I terms are of two AP’s
We have sub,