Question

if 2+4=8 ,4+7=15 and 6+12=24 then 9+21=??

Answer 1

Answer:

39.

Step-by-step explanation:

2+4=2+2+4=8

4+7=4+4+7=15

6+12=6+6+12=24

9+21=9+9+21=39

Answer 2

Answer:

$\huge{\fbox{\fbox{\bigstar{\mathfrak{\red{Answer}}}}}}$

Step-by-step explanation:

$9 + 21 = 30..$

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