Question

find the 9th term from the end(towards the first term) of the A.P 5,9,13....185​

Answer 1

Step-by-step explanation:

An = a + (n-1)d

185 = 5 + (n-1)4

180 = 4(n-1)

n - 1 = 45

n = 46

9th term from the end

A(38) = a + 37d = 5 + 37(4) = 5+148 = 153

Answer 2

Step-by-step explanation:

A. P:-5,9,13,.... 185.

a = 5,d= 9-5= 4,añ= 185,n=?

An= a+(n-1)d

185 = 5+ (n-1)4

= 5+4n-4

= 1+4n

4n= 184

n = 184/4

= 46.

9 th term = 46-9= 37th term.

37 th term = a+36d

=5+36(4)

= 5+144

= 149.