Q. 154.2( 6 Votes )

# Find the 12th term from the end of the AP – 2, - 4, - 6, …, - 100.

Given: AP” – 2, - 4, - 6, …, - 100”

To find: 12th term from the end.

Formula Used:

the nth term 'an' of an AP from the end is

an = l - (n - 1) d

where l is the last term and d is the common difference.

Explanation:

Consider AP, – 2, - 4, - 6, …, - 100.

Here,

first term, a = - 2

common difference, d = - 4 – (2) = - 2

last term, l = - 100.

We know that, the nth term 'an' of an AP from the end is

an = l - (n - 1) d

where l is the last term and d is the common difference.

12th term from the end,

a12 = - 100 - (12 - 1) - 2

= - 100 + 22

= - 78

Hence, the 12th term from the end is – 78.

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