Question

In AP a d = -4 , n = 7, an= 4 , find a​

Answer 1

Step-by-step explanation:

formula of an=a1+(n-1)d

so as per problem,

=an=a1+(n-1)d

=7=a1+(7-1)-4

=7=a1+6(-4)

7=a1+(-24)

-a1=-24-7

-a1=-31

a1=31( minus in LHS and RHS gets cancelled).

hope it may help u....