Question

Find the 20th term from the last term of the A.P. 2, 7, 12, …, 252.
fast ​

Answer 1

Answer:

Step-by-step explanation:

For the given A.P.,

First term(a)=3

Last term(t

n

​

)=253

Common Difference(d)=8−3=5

∵t

n

​

=a+(n−1)d

⇒253=3+(n−1)×5

⇒253−3=(n−1)×5

⇒250÷5=n−1

⇒50+1=n

∴n=51

In 51 terms, 20

th

 term from the last term will be 51−20+1=32

th

∴t

32

​

=a+(32−1)d=3+31×5=3+155=158