Complete the series: 1, 3, 7, 15, 31, 63, ……? A) 123 B) 125 C) 127 D) 129 Solution Starting with the first number ‘1’, we move ahead in the way given below: 1 x 2 + 1 = 3 3 x 2 + 1 = 7 7 x 2 + 1 = 15 15 x 2 + 1 = 31 31 x 2 + 1 = 63 63 x 2 + 1 = 127 Therefore 127 is the next number in the series. Related MCQs: Complete the series: 2, 4,10, 28, ……? Fill in the blanks: “New legislation …… in the Assembly but it ……. by many.” He is knocking …… the door. .آپے سے باہر” ہونا اس محاورے کا مطلب کیا ہے “