3 and 4 .Determinants and Matrices
easy

જો કોઈ શ્રેણિકને $18$ ઘટકો હોય, તો તેની શક્ય કક્ષાઓ કઈ હોય ? જો તેને $5$ ઘટકો હોય, તો તેની શક્ય કક્ષાઓ શું થાય?

Option A
Option B
Option C
Option D

Solution

We know that if a matrix is of the order $m \times n,$ it has $mn$ elements.

Thus, to find all the possible orders of a matrix having $18$ elements. we have to find all the ordered pairs of natural numbers whose products is $18$ .

The ordered pairs are : $(1,18),\,(18,1),\,(2,9),\,(9,2),\,(3,6),$ and $(6,3)$

Hence, the possible orders of a matrix having $18$ elements are :

$1 \times 18$, $1  8 \times 1$,  $2 \times 9$,  $9 \times 2$,  $3 \times 6$ and $6 \times 3$

$(1,5)$ and $(5,1)$ are the ordered pairs of natural numbers whose product is $5 .$

Hence, the possible orders of a matrix having $5$ elements are $1 \times 5$ and $5 \times 1$.

Standard 12
Mathematics

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