Question

If 3n is an odd number,which of the following is an even number?
(a) 3n-1 (b) 3n + 2 (c) 3n -2 (d) 3n +2n

Answer 1

Answer:

a)3n-1

Step-by-step explanation:

When 1 is added or subtracted from an odd number then it is always even.

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Answer 2

Given: 3n is an odd number.

To find: Which of the following is an even number.

Solution:

An odd number when added to another number gives an even number. An odd number added to an even number gives an odd number. When an odd number is subtracted from an odd number it gives an even number. When an even number is subtracted from an odd number it gives an odd number.

Hence, 3n-1 is even, 3n+2 is odd, 3n-2 is odd, 3n+2n is odd.

Therefore, 3n-1 is an even number.