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**1+4=5**

**now add 5 to the second equation**

**5+2+5=12**

**similarly add 12 to the third equation**

**12+3+6=21**

**add 21 to the fourth equation**

**21+8+11=40**

**This adding the result of the first sum gives us the answer of the second**

1+4=5 okkkk

then add 5 to another equation

2+5+5=12

then add 12 to next eq

3+6+12=21

then add 21 to next eq

8+11+21=40

i think so u got iit

have a nice day