Question 252524
Given, a1+a2+a3+a4+a5+a6+a7+a8+a9+a10+a11+a12= 360
                                          78a= 360         
                                            a= 360/78
                                            a= 60/13   ....(1)
Next, a1+a3+a5+a7+a9+a11= 36a
                        = 36*60/13
                        = 2160/13
                        = 166 2/3