Question

For an A.P., if tn = 4, d= - 4, then a = ...​

Answer 1

t

7

=4

d=−4

Now,

t

n

=a+(n−1)d

t

7

=a+(7−1)d

⇒4=a+6(−4)

⇒4=a−24

⇒a=4+24

⇒a=28