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                                    A, B, C are three points on a horizontal line through the base O of a pillar OP, such that OA, OB, OC are in A.P. If alpha, beta, gamma the angles of elevation of the top of the pillar at A, B, C respectively are also in A.P. then sin alpha, sin beta, sin gamma are in | 
                            
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Answer»  A.P.  | 
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