We are given with 1 + 4 = 5 2 + 5 = 12 3 + 6 = 21 8 + 11 = <span>?
</span>The answer is <span>40. </span>1 + 4 = 5 (simply 1 plus 4) 2 + 5 = 12 (this is supposed to be 7 but adding 5 from the previous sum results to 12) 3 + 6 = 21 (this is supposed to be 9 but adding 12 gives 21) 8 + 11 = <span>40 (this is supposed to be 19 and adding 21 gives 40)</span><span> </span><span /><span> </span>