Question

Find the 10 term from the last term of the A.P 3,8,13---------253

Answer 1

you can use this formula

Answer 2

Solution:

a = 3, d = 5

we have to find from end then write the AP from end

253, 248, 243, ......., 3

For this AP

a= 253

d = 248-253 =-5

an=a+ (n-1)d

a10=253+(10-1)(-5)

a10=253+9(-5)

a10=253-45

a10=208