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Question

Find the missing number in the figure.

Q28.

आकृति में लुप्त संख्या ‘?’ खोजिए।

Q28

.


A

(a) 8

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B

(b) 42

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C

(c) 30

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D

(d) 15

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Solution

The correct option is C

(c) 30


You need to consider the symmetry inherent in the figure. The inner circle is divided into four parts. In three of these parts there is a number. This number, it is sensible to think, should come out of the two numbers in the outer oval that are in the same quadrant.

Now 7 × 6 = 42 = 84 ÷ 2

4 × 8 = 32 = 64 ÷ 2

9 × 7 = 63 = 126 ÷ 2

So, the number in the empty quadrant of the smaller oval would 3 × 5 × 2 = 30.

आपको आंकड़े में अंतर्निहित समरूपता पर विचार करने की आवश्यकता है। आंतरिक वृत्त को चार भागों में बांटा गया है। इन तीनों हिस्सों में एक संख्या है। यह संख्या, एक ही चतुर्थांश में स्थित बाहरी वृत्त के दो संख्याओं से ज्ञात होनी चाहिए।

अब 7 × 6 = 42 = 84 ÷ 2

4 × 8 = 32 = 64 ÷ 2

9 × 7 = 63 = 126 ÷ 2

तो, छोटे वृत्त के खाली चतुर्भुज में संख्या 3 × 5 × 2 = 30 होगी।


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