Question

Find the next in the sequence
5, 21, 69, 213, 645, ?

Answer 1

Answer:

See,

in this series: 5, 21, 69, 213, 645

21 - 5 = 16 => 16 * 3 = 48.

69 - 21 = 48 => 48 * 3 = 144.

213 - 69 = 144 => 144 * 3 = 432.

645 - 213 = 432. => 432 * 3 = 1296.

So, 1296 + 645 = 1941.

Hence answer is 1941