Guess The Next Number in Series : 1 3 = 5 , 3 5 = 11 , 5 11 = 21 , 11 21 = ? July 27, 2016Logic Puzzles11 21 = ?, 3 5 = 11, 5 11 = 21, Guess The Next Number in Series : 1 3 = 5, kids puzzle, kids riddle, number puzzle, number seriesadminQuestion :Guess The Next Number in Series : 1 3 = 5 , 3 5 = 11 , 5 11 = 21 ,11 21 = ?Answer :series sum = 2nd number + 2(1st number)21+2(11) = 4343Share this:Click to share on Facebook (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on WhatsApp (Opens in new window)