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Only three persons was born between the one who likes Guava and R, whose age is in multiple of 5. T was born immediately after the one who likes Guava. The difference between the ages of U and the one who likes Mango is 11 years. U is not elder than the one who likes Mango. T does not like Mango.
In case 1a, 1b, 2c the above conditions are not satisfied. Hence these are dropped. Q was born immediately before the one who likes Papaya.hence case 2a is splinted into 2ai) and 2a ii) because it has two possibilities. The difference between the ages of V and the one who likes Banana is same as the difference between the ages of W and the one who likes Papaya. So, Case-2a ii) and case 2b will be dropped.
As many persons born between Q and the one who likes Orange is same as between S and the one who likes Papaya. The age difference between S and V is not more than 10 years. So the final arrangement is,
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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