# Sums and Products – 2 MCQ’s

This set of MATLAB Multiple Choice Questions & Answers (MCQs) focuses on “Sums and Products – 2″.

1. What is the output of the following code?

meanabs(1,2,-1)

a) 1.33

b) 1

c) 0

d) .666

2. What is the output of the following code?

A=[1:3:7;2:3:8;3:3:9]; prod(A,1)

a) Error

b) 6 20 504

c)

6 20 504

d) 28 80 162

3. What is the output of the following code?

meansqr(NaN)

a) 0

b) NaN

c) Error

d) 1

4. What is the output of the following code?

prod(1:NaN)

a) 0

b) 1

c) NaN

d) Error

5. What is the output of the following code?

cumsum[NaN]

a) NaN

b) 0

c) Error due to NaN

d) Syntactical Error

6. The product of a set of elements is always greater than it’s the cumulative sum.

a) True

b) False

7. What is the output of the following code?

cumsum([1,2,3,4,NaN])

a) 1 3 6 10 NaN

b) NaN

c)

1 3 6 10 NaN

d) Error

8. What is the output of the following code?

A=[1:3:7;2:3:8;3:3:9]; prod(A,2)’

a) 28 80 162

b)

20 80 162

c) Error

d) NaN

9. The function to find the R.M.S value is __________

a) sqrt(meansqr())

b) sqrt[meansqr[]]

c) sqrt(meansqr[])

d) sqrt[meansqr()]

10. What is the output of the following code?

cumsum(1,2,-1)

a) 1 3 2

b) 2

c) Error due to input

d) Error due to syntax

11. Which function does cumulative summation of elements?

a) sumcum[]

b) sumcum()

c) cumsum[]

d) cumsum()

12. The result of cumsum([1,2,3]) and sum([3,3]) are ____________

a) Same

b) Different

c) Absolute numbers

d) Signed numbers

13. The sum function will return a NaN if any of the element in the input vector is NaN.

a) True

b) False

14. What is the output of the following code shown?

syms a k; symsum(a^k, 0, Inf)

a) 1/1-a

b) Inf

c) Error due to Inf

d) Error due to an unmentioned value of a

15. What is the output of the following code?

syms a,k; symsum(a^k, 1, Inf)

a) Error

b) -1/(a-1) -1

c) -1/(a-1)

d) Inf

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