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faust18 [17]
3 years ago
10

If 2 = 6, 3 =12, 4 = 20, 5 = 30, 6 = 42 then 9 = ?

Mathematics
1 answer:
Soloha48 [4]3 years ago
6 0
At first you may get confused but look at those numbers carefully :)

as you see first result is divisible buy one of the product (second product in all cases is unknown)
so let's check where it will lead us :)

6/2=3

12/3=4

20/4=5

30/5=6

42/6=7

Now you can clearly see that every number was multiplied by number 1 higher than itself. 
2*(2+1)=6

3*(3+1)=12

4*(4+1)=20

etc...

it means that after equation sign there should be 90 because 

9*(9+1)=90 :)
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