質問: 4+1=5 5+2=12 3+6=21 8+11=? - maths q&a 4+1=5 5+2=12 3+6=21 8+11=? - maths q&a
回答: given 1+4 =5 and 2+5 =12 and 3+6 = 21, we need to find 8+11=? the given sets of addition follows a series of logical thinking we can notice that 1+4 = 5 ----------(i) as per mathematical techniques 2+5 = 7----------(ii) as per mathematical techniques given 2+5=12 here they have added the result of 1+4 = 5 so 2+5= 7 + 5 =12 ( from (i)) similarly 3+6 =9 -------(iii) 3+6= 9 +12= 21 ------- (from (ii) so 8+11=19 +12 = 40 (from (iii)) hence 1+4 =5 and 2+5 =12 and 3+6 = 21, then 8+11= 40