- Home
- Standard 12
- Mathematics
જો કોઈ શ્રેણિકને $18$ ઘટકો હોય, તો તેની શક્ય કક્ષાઓ કઈ હોય ? જો તેને $5$ ઘટકો હોય, તો તેની શક્ય કક્ષાઓ શું થાય?
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 $5 \times 1$.