If a_1 = a_2 = 2, ; a_n = a_ n - 1 - 1 ;(n > 2), then a_5 is - Vidyadip

MCQ

If ${a_1} = {a_2} = 2,\;{a_n} = {a_{n - 1}} - 1\;(n > 2)$, then ${a_5}$ is

A
$1$
✓
$- 1$
C
$0$
D
$- 2$

✓

Answer

Correct option: B.

$- 1$

b
(b) Obviously, ${a_3} = {a_2} - 1 = 2 - 1 = 1$

${a_4} = {a_3} - 1 = 1 - 1 = 0$

${a_5} = {a_4} - 1 = 0 - 1 = - 1.$

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