Indian Railways to become Net Zero Carbon Emitter by

15, 31, 67, 131, ?, 375

What will come in place of the question mark (?) in the following series?

121, 110, 97, ?, 61, 38

12 ? 545 2729 10919

14, 20, 29, 44, 65, ?

306, 272, 240, ?, 182, 156

What will come in place of the question mark (?) in the following series?

130, 158, 214, 298, ?, 550

What will come in place of the question mark (?) in the following series?

10, 135, ?, 226, 234, 235

58, 63, 78, ?, 138, 183

What will come in place of the question mark (?) in the following series?

45, 54, 72, ?, 126, 162