Synopsis IAS

Answer

Solution

UPSC Prelims

Mathematics

Theme:

Number System / संख्या पद्धति

Q2 2018, Number System

Consider the following sum: +1+2+3+1=21. In the above sum, stands for

नीचे दिए गए योग पर विचार कीजिए: +1+2+3+1=21 उपर्युक्त योग में किसके लिए है?

Explanation

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The given expression can be expanded as:

x + 10 + x + 20 + x + 10(x) + 3 + 10(x) + 1 = 210 + x

On solving, we get: x = 8.

Here we used the concept of face value and place value - a number 2• can be 25 = 20 + 5 = 2x10 + 5.

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Q 2. 2018, Number System

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