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Question

1715×1715+215×2151715×415 is equal to:

A
0
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B
1
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C
10
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D
11
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Solution

The correct option is B 1
Given exp =1715×1715+215×2152×1715×215
=(1715)2+(215)22×1715×215
=(1715215)2 [Using a2+b22ab=(ab)2]
=(1515)2=12=1

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