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###### Dristi Vashishtha posted an Question
January 05, 2022 • 19:25 pm 30 points
• IIT JAM
• Mathematics (MA)

# 9. if matrix a is m x n and b is n xp, then number of multiplication operations and addition operations needed to calculate the matrix ab, respectively are (a)

9. If matrix A is m X n and B is n xp, then number of multiplication operations and addition operations needed to calculate the matrix AB, respectively are (a) mn'p, mpn (c) mpn, mpn (b) mpn, (n- 1 }mp (d) mn'p, (m + p)n

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• ##### Anonymous User

no of multipiction operation =(mxn)(nxp)=mnp bcz first matrix has m rows n column if we multipal first row with first column then n multipal operation.first row multiply p column so np operation there for total =mnp no of addition operation =m(n-1)p bcz first matrix has m rows n column if we multipal first row with first column then n-1 addition operation.first row multiply p column so (n-1)p operation therefor total =m(n-1)p

• ##### Dristi vashishtha

according to this formulla answer should be n(m+p)

• ##### Anonymous User

option B

what have you done in no. of addition operation

reverse the order of p then n-1

still i didn't get

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