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Ratio of profit shares of 'P' and 'Q' = (4800 X 15):(7200 X 12) = 72000:86400 = 5:6 So, profit share of 'Q' = 3500 X (6/5) = Rs. 4200 And so, total profit of 'P' and 'Q' = 3500 + 4200 = Rs. 7700 Hence, option d.
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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