Question

(iii) If last term of A.P is 21/2 what is the fourth term from the end. "-1/2" 1/2 3/2 5/2​

Answer 1

Step-by-step explanation:

a=−11,

d=3

an=49

an=a+(n−1)d

49=−11+(n−1)×3

360=n−1

n−1=20

n=21st term

Fourth term from the end

=18th term

a18=a+(18−1)d

=−11+17×3

=−11+51

a18=40.

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