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Question

120+130+142+156+172+190+1110+1132 is equal to:

A
18
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B
17
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C
16
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D
110
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Solution

The correct option is D 16
Given exp.. =14×5+15×6+16×7+17×8+18×9+19×0+110×11+111×12
=(1415)+(1516)+(1617)+(1718)+(1419)+(19110)+(110111)+(111112)

=14112=3112=212=16

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