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CBSE Class 10- Mathematics: Chapter β 5 Arithmetic Progressions Part 21
Question 11:
If the sum of terms of an AP is and its term is , find the value of
Answer:
Put n = 1,2, 3, β¦
Question 12:
If the sum of three numbers in AP, be and their product is , find the numbers.
Answer:
Let no. be
5,8, 11, β¦ 11,8, 5, β¦
Question 13:
If are in AP, then prove that are in AP
Answer:
Given are in AP
Then β¦ (i)
If are in AP then
From (i) and (ii) ,
Hence proved.
Question 14:
If be the sum of , and 3 n terms respectively of an AP, prove that
Answer:
R. H. S