Question -
Answer -
Given, A.P., -2, -4,-6, …, -100
Here, first term (a) = -2,
common difference (d) = -4 – (-2)
and the last term (l) = -100.
We know that, the nth term an of an A.P. from the end is an = l– (n – 1 )d,
where l is the last term and d is the common difference. 12th term from theend,
an = -100 – (12 – 1) (-2)
= -100 + (11) (2) = -100 + 22 = -78
Hence, the 12th term from the end is -78