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B
180
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C
145
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D
96
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E
None of these
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Solution
The correct option is B 180
When two teachers from each stream are to be included, then number of ways =4C2×5C2×3C2=4!(4−2)!×2!×5!(5−2)!×2!×3!(3−2)!×2!=4×3×2!2!×2×1×5×4×3!3!×2×1×2!×31×2! =2×3×5×2×3=180