an important question from the book -ML aggarwal( avichal publication)class 10th , chapter9, Arithmetic Progression……..
This type of question has been asked in paper. so please solve it in detail.
Find the indicated terms in each of the following arithmetic progression:
1,6,11,16,…,a20
Rajan@2021Guru
Find the indicated terms in each of the following arithmetic progression: 1,6,11,16,…,a20 ,
Share
From the question,
The first term a=1
Then, difference d=6−1=5
11−6=516−11=5
Therefore, common difference d=5
From the formula,
an=a+(n−1)d
So,a20=a+(20−1)d=1+(20−1)5=1+(19)5=1+95=96
Therefore, a20=96