1, 2, 6, 7, 21, 22, 66, 67, ?
ক
70
খ
134
গ
201
ঘ
301
সঠিক উত্তর: 201
The pattern is + 1, x 3, + 1, x 3, + 1, x 3, + 1,.....So, missing term = 67 x 3 = 201.