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Question

What is the total number of ways of selecting at least one ring from 2 sets of 10 identical rings?

A
100
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B
120
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C
119
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D
121
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Solution

The correct option is B 120
If all rings are identical, then number of ways is 11.
Since there are 2 sets, there are 11 × 11=121 ways
Since atleast 1 has to selected, number of ways = 121 - 1 = 120 ways.

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