Question

select a number which cannot be obtained by adding a number twice
a. 318
b. 626
c. 170
d. 589
plzzz answer fast​

Answer 1

Answer:

589 it is the answer of question

Answer 2

The correct answer is option (d) 589.

Given:

Number to be added twice

To Find:

Number which could be obtained when a number is added twice.

Solution:

To find the correct answer we can divide each of the numbers given in the option by 2. The only number which cannot be obtained by adding a number twice will be the one who leaves a remainder when divided by 2.

The logic behind such a method is that when a number is added twice, it is basically getting multiplied by 2 or is increasing by 100%. So, by dividing each numbers by 2, we will essentially get the original number and the number which leaves a remainder will be the one which is not a result of a number getting added twice.

For example, if we divide 318 (Option a) by 2, we get 159 (no remainder).

That means, 159 when added twice gives 318.

Similarly, 626 when divided by 2 gives 313 and 170 when divided by 2 gives 85.

However, when we divide 589 by 2, it leaves a remainder, i.e., 1. It means that 589 cannot be obtained by adding two whole numbers.

Hence, Option (d) is the correct answer.

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