Question

Find the 12th term from the last term of ths A.P-2,-4,-6,....,-100​

Answer 1

Step-by-step explanation:

let a be the first term and d be the c.d.

.: c.d =-2

given, last term =-100

last 12th term=l-11 d

=-100-{-22}

=-78

hence last 12th term=-78

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Answer 2

$= a + (n - 1)d$

a (from the last) = -100

d (from the front) = -4-(-2) = -4+2 = -2

d (from the last) = +2

n = 12

put in formula

$= - 100 + (12 - 1)2$

$= - 100 + (11) \times 2$

$= - 100 + 22$

$= - 78$

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