Question

3. If A is a 2X3 matrix and B is a 3X4 matrix, how many columns does AB

(A) 3 (B) 4 (C) 2 (D) 5

4. Sum of first ‘n’ odd natural numbers is _______.

(A) ( n(n+1))/2 (B)(n(n+1)(2n+1))/6 (C)n2 (D)[(n(n+1))/2] 2



5. The total surface area of a hemi-sphere is how much times the square of its radius.

A) π B) 3π C) 2π D)3π

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Answer 1

Answer:

3) resultant matrix will have 3 row and 3 column i.e 3×3

4) ( n(n+1))/2

5) 3π