Question

In an AP, if a=10, d=5and n=100, then find the value of a100 and also find the 50th term from the end.

Answer 1

a100=a+(n-1)d

a100=10+(99)5

a100=450

now there are 100 terms totally now formula is

r=50 now,you get 51th term i.e.50th term form last is 51th term form starting

so a51=10+(50)5

a51=260

so 50th term from last is 260

Answer 2

Answer:

245

Step-by-step explanation:

Un = 10+ 5n-5 =5n+5

U49  =5(n+1) = 5(49) = 245