Question
A team of 4 members is to be formed from 5 girls and 4
boys. Find the number of ways to form team such that the team consists of at most 2 girls.Solution
Required number of ways = 5C2 × 4C2 + 5C1 × 4C3 + 4C4
= 10 × 6 + 5 × 4 + 1
= 60 + 20 + 1 = 81
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2 × (sec 60° – sin 30°)
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sin 25° × cos 65° + sin 65° × cos 25°
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