If number of rows in matrix A is 10 and number of elements = 70 . Also if B has same rows as columns in matrix A . Then find number of columns in B if it has 21 elements
7
4
3
10
As we have learned
Compact form of matrix -
- wherein
aij - element of the ith row and jth column
m - no. of rows
n - no. of columns
Given
Thus
Also ,
Thus
Option 1)
7
Option 2)
4
Option 3)
3
Option 4)
10
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