Out of 10 good and 5 fused bulbs, in how many way can 7 bulbs be picked up so that each group may contain at least 5 good bulbs
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The number of ways in which the bulbs can be picked so that each group may contain at least 5 good bulbs is 3690
• This question can be solved by using combination.
• Number of ways in which the bulbs can be picked
= [(10C5) * (5C2)] + [(10C6) * (5C1)] + [(10C7) * (5C0)]
= 252*10 + 210*5 + 120*1
= 3690
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