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3 years, 10 months ago
3 years, 10 months ago
If only one switch is switched on, it can be done in 8 ways. If 2 switches are switched on, it can be done in 8-2+1 = 7 ways. Similarly for 3 switches, it will 8-3+1 = 6 ways. Thus, the answer is 8+7+6+5+4+3+2+1. Ans = 36
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