Evaluate the following: ` |[42,1,6],[28,7,4],[14,3,2]| `

Evaluate the following: |[1/2, 8],[4,2]|

Evaluate the following : [[1,2,-3],[-2,1,7]] [[2,3,1],[5,4,2],[1,6,3]]

Compute the following: [[-1,4,-6],[8,5,16],[2,8,5]]+[[12,7,6],[8,0,5],[3,2,4]]

Find the mean of the following 3, 4, 6, 7, 8, 14.

Find the values of the following determinants |{:(4,0,2),(1,5,-6),(3,-2,8):}|

Find the values of a and b for which the following holds: [[4,2],[3,-1]][[a],[b]]=[[-4],[2]]

Find the following: 7/(14)-3/(4)-1

Evaluate: 2.8 xx 14

Find the values of x and y from the following equation: 2[[x,5],[ 7,y-3]]+[[3,-4],[ 1, 2]]=[[7, 6],[ 15 ,14]]

Evaluate the following: (i) 6! -5! (ii) (30!)/(28!) (iii) (15!)/(12!3!) (iv) (1)/(4!)+(1)/(5!) +(1)/(6!)