Question

Write 7th term from the end of the ap, 7,9,11,13......213

Answer 1

Ap from end 213,211,209.................7
a=213
d=a2-a1
d=211-213=-2
a7=a+(n-1)d
a7=a+6d
Putting values
a7=213+6×-2
a7=201

Answer 2

Heya,

A.P. = 7, 9, 11, 13.....213

To find 7th term from the end we will first reverse the given A.P.
Then we get,
A.P. = 213, 211,......9, 7

a = 213

d = 211 - 213

d = -2

n = 7th

An = a + (n - 1)d

A7 = 213 + (7 - 1)(-2)

A7 = 213 + 6×(-2)

A7 = 213 - 12

A7 = 201

So, 7th term of A.P. from end = 201

Hope this helps....:)