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Question

Q. What number will come in the place of the question mark?
Choose the correct answer using the codes given below:

Q. प्रश्नवाचक चिन्ह के स्थान पर कौन-सी संख्या आएगी?




A
7
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B
3
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C
6
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D
5
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Solution

The correct option is B 3
It can be observed that in every row the third number is the difference between the cube of the first number and the square of the second number as shown below,
1st row: 53 – 42 = 125 – 16 = 109
3rd row: 103 – 72 = 1000 – 49 = 951
Let P be the missing number.
Similarly, 83 – P2 = 503
Or P2 = 512 – 503 = 9
Or P = 3
Thus, the missing number is 3.
Hence, option (b) is the correct answer.

यह देखा जा सकता है कि प्रत्येक पंक्ति में नीचे दिए अनुसार तीसरी संख्या, पहली संख्या के घन और दूसरी संख्या के वर्ग के बीच का अंतर है,
53 – 42 = 125 – 16 = 109
103 – 72 = 1000 – 49 = 951
माना कि P लापता संख्या है।
इसी प्रकार 83 – P2 = 503

या P2 = 512 – 503 = 9


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