a - [2b - {3c - (a - 2b + 3c)}] এর মান কত?
সমাধান
সঠিক উত্তর: Option B
a - [2b - {3c - (a - 2b + 3c)}]
= a - [2b - {3c - a + 2b - 3c}]
= a - [2b - { - a + 2b}]
= a - [2b + a - 2b]
= a - [a]
= a - a
= 0
= a - [2b - {3c - a + 2b - 3c}]
= a - [2b - { - a + 2b}]
= a - [2b + a - 2b]
= a - [a]
= a - a
= 0