Question

3, 5, 9, 15, 25, 41, 67 ?

ANSWER IS 109 BUT HOW CAN ANYONE
GIVE THE METHOD AND FORMULA?​

Answer 1

Answer:

The difference between the number in this series is the sum of two previous differences .

See the attachment

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Answer 2

3+2=5

5+4=9

9+6=15 or 9+4+2=15

15+10=25 or 15+6+4=25

25+16=41 or 25+10+6=41

41+26=67 or 41+16+10=67

67+42=109 or 67+26+16=109

In the answer bold text is sum of Italian text

Where Italian is sum of Bold text in previous two serie sum

like 42

we get 42 by adding 26 and 16

which are above 42 in Bold text