If n is an even number, all of the following must also be even except

Step-by-step explanation:

Given

Required

Which cannot be even

To do this, we assume an even number for n;

Assume that

So, we have:

--- this is odd

---- this is even

--- this is even

--- this is even

Hence, (a) can't be even

c

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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