Question

3. Find the 12 term from last of A.P.3.8.13....253.
​

Answer 1

Step-by-step explanation:

Here

first term is 3

common difference is 5

To find the 12th term from last we take

first term = 253 ( as from last)

and common difference =-5 (as from last)

now

a20= a+(n-1)d

a20= 253+(12-1)-5

a20=253+(11)-5

a20=253+(-55)

a20=253-55

a20=198

so the 12th term from last is 198