1 3 10 21 July 8, 2019 16 32 64 128 1 3 10 21 series 1 samuel 3 10-21 1 corinthians 3 10 21 1 3 x 10 21 Complete the series 1 3 10 21 1 3 6 10 x 21 28 1 10 21 x 15 3 4 1 10 21 times 15 3 4