1.

Find the 8th term from the end of the AP 7,1013....1814

Answer»

SOLUTION : Here !!

first term is 7 say "a"

and last term is 184 say "an"

if the no. of terms are n

D ( common difference) = 13-10 = 10-7 => 3

Now we have to find the 8th last term so it will be easier for us if we will reverse the AP

=> 184,181, ..........13,1 0,7

now D = -3 and a = 184

an = 7

Now we have to find 8th term :-

use an = a+(n-1)d

just PLUG in the values....

a8 = 184 + (8-1)×-3

a8 = 184 -21

a8 = 163


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