1.

Find the missing number.12,15,917,21,13___20,18​

Answer»

\LARGE{\bf{\underline{\underline{GIVEN\::-}}}}

Find the missing number.

  • 12,15,9

  • 17,21,13

\LARGE{\bf{\underline{\underline{TO\:FIND\::-}}}}

  • The Missing Number.

\LARGE{\bf{\underline{\underline{SOLUTION\::-}}}}

12, 15, 9

= 12 + 3

= 15 - 6 = 9

As 12 + 3 is 15 we should double the number and subtract the NEXT number ( Applicable only the some kind of sums ).

_________

17, 21, 13

= 17 + 4 = 21

= 21 - 8 = 13

_________

__ 20, 18

= 19 + 1 = 20

= 20 - 2 = 18

So, Here we have to GET the solution in the correct manner. That's why I subracted 20 - 18 to get 2, and did - 1 because it should be the GREATER number, This is also a method for doing these.

∴ 19, 20, 18


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