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1.Set Theory
hard
અહી $S=\{4,6,9\}$ અને $T=\{9,10,11, \ldots, 1000\}$ છે. જો $A=\left\{a_{1}+a_{2}+\ldots+a_{k}: k \in N, a_{1}, a_{2}, a_{3}, \ldots, a_{k} \in S\right\}$ હોય તો ગણ $T - A$ ના બધાજ ઘટકોનો સરવાળો મેળવો.
A
$10$
B
$9$
C
$11$
D
$12$
(JEE MAIN-2022)
Solution
$S =\{4,6,9\} \quad T =\{9,10,11 \ldots 1000\}$
$A \left\{ a _{1}+ a _{2}+\ldots . .+ a _{ k }: K \in N \right\} \,and\, a _{ i } \in S$
Here by the definition of set '$A$'
$A=\{a: a=4 x+6 y+9 z\}$
Except the element $11$,every element of set $T$ is of of the form $4 x+6 y+9 z$ for some $x, y, z \in W$
$\therefore T – A =\{11\}$
Standard 11
Mathematics