What is common among the seemingly uncommmon among the following:

  1. One of the types of human blood groups

  2. Grading representation in schools

  3. Part of alternate representation for Like/ up vote

  4. Mother of all numerical operations, well, considered in a way

  5. That type of growth usually goes up and right


  • 1
    $\begingroup$ I was thinking of "a positive(+)" but can't seem to meet 4th requirement. $\endgroup$
    – Firelord
    Commented Aug 29, 2017 at 15:16
  • $\begingroup$ Good thought process @Firelord, you should have posted your answer ! $\endgroup$ Commented Aug 29, 2017 at 15:31
  • $\begingroup$ Well I'm new here and didn't know one can post partial answers here too. I'll try next time. $\endgroup$
    – Firelord
    Commented Aug 29, 2017 at 15:32

2 Answers 2


The common factor is

+ (the plus sign)

  1. Blood type

    For the gene A, B, or O, you can have a positive (+) or negative (-) type.

  2. Grading representation

    For each letter grade (A, B, C, etc.) some schools assign plus or minus for granularity. For example, A+ > A > A- > B+ > B, and so on.

  3. Like/upvote

    An upvote are sometimes referred to as +1 (plus one vote).

  4. Operators

    Addition (X + Y) is one of the first mathematical operations that people learn. Subtraction is negative addition, and multiplication is repeated addition.

  5. Growth

    A monotonic function with a positive rate moves up and right. For example, in the function y=2x, the rate is +2 (positive); and when you visualize the graph, the value of y moves up as you move right along the x axis.

  • $\begingroup$ Good one @Mike Q, you got it fully correct ! $\endgroup$ Commented Aug 29, 2017 at 15:30
  • $\begingroup$ @Dexter Maybe not, it's easy to find out in an instant... $\endgroup$
    – EKons
    Commented Aug 29, 2017 at 16:05

The pattern is:

The first 5 letters of the alphabet


A is a blood group


B is a grade that is given in schools




D for differentials/derivatives


E for exponential graph - which is a graph that is always growing... i.e. up and to the right

  • 1
    $\begingroup$ Nice try, @Dexter. Liked the variants in explaning the clues ! $\endgroup$ Commented Aug 29, 2017 at 15:32

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