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Question

(9999991000×7) is equal to

A
699371000
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B
700071000
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C
663371000
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D
69999931000
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Solution

The correct option is D 69999931000
Given expression =(999+9991000)×7
=10001+111000×7
=(100011000)×7=700071000
=6999+171000=6999+9931000
=69999931000

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