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Let the sum invested by 'A' and 'B' be Rs. '3x' and Rs. '4x', respectively. Ratio of profit shares of 'A', 'B' and 'C', respectively, at the end of the year: = (3x X 12) :(4x X 12) :(75000 X 8) = 3x:4x:50000 ATQ; (4x/50000) = (4/5) Or, 'x' = 10000 So, sum invested by 'B' = Rs. '4x' = 4 X 10000 = Rs. 40,000
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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