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    7.  Sujoy  is  filling a magic  box  where the  sum     9.  Rahul is replacing each letter with a suitable
                         of all rows, columns, and diagonals must be         number  in each box  of the magic  square.
                         18. He filled the numbers in the 3 × 3 grid but     What is the value of B + E more than D − C?
                         made a mistake.                                                             (Analytical Thinking)

                                        9   2   7                                  8    1  A
                                        6   4   8                                  B   5   C

                                        5  10   3                                  D   E    F

                         Which correction  will  make  the magic  box
                         correct?                    (Decomposition)                (a)  9              (b)  – 1
                               (a)  Interchange 3 and 10                            (c)  2              (d)  0
                                                                         10.  Rohan has some coins in his piggy bank. He
                               (b)  Interchange 6 and 4                      has:
                                                                                •  an even number of `1 coins,
                               (c)  Interchange 2 and 7
                                                                                •  an odd number of `2 coins, and
                               (d)  Interchange 5 and 9                         •  an odd number of `5 coins.
                                                                             After counting, he says that the total amount
                      8.  In how many ways can the number 10001 be           of money is `48. Is his statement correct?
                         written as a sum of two primes?                                            (Algorithmic Thinking)
                                                    (Critical Thinking)
                                                                                    (a)  Yes, because the total can be even.
                               (a)  1
                                                                                    (b)  No, because the total must always
                               (b)  2                                                  be odd.
                                                                                    (c)  Yes, because the number of coins
                               (c)  0                                                  does not affect the total.

                               (d)  More than 2                                     (d)  Cannot be determined.

                                       In a sequence of six doors, each door has a doorbell on right side. Pressing
                                       the doorbell, a door opens the adjacent doors only (left and right). What is the
                                       minimum number of doorbell you need to press to open all the doors?

                                             (a)  2                                 (b)  4

                                             (c)  3                                 (d)  5

                                                                                                   Number Play        31

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