Leren
Een rij waarbij elk element de som is van de twee voorgaande.
A Fibonacci-type sequence (also called a recursive additive sequence) is one where each term equals the sum of the two terms before it. The classic Fibonacci sequence starts with 0 and 1, but any two starting numbers create a valid Fibonacci-type sequence. These patterns appear in nature (flower petals, pinecones, shells) and have fascinating mathematical properties.
aₙ = aₙ₋₁ + aₙ₋₂
- 1, 1, 2, 3, 5, 8, 13, 21... (classic Fibonacci)
- 2, 5, 7, 12, 19, 31... (starts with 2 and 5)
- 1, 3, 4, 7, 11, 18... (Lucas numbers)
Zo herkent u het
- Check if each term equals the sum of the two before it
- Look for accelerating growth that's not purely multiplicative
- The differences between terms will themselves form a pattern
Veelgemaakte fouten
- Only expecting the classic 1, 1, 2, 3, 5... pattern
- Confusing with simple addition sequences
- Not checking multiple pairs of consecutive sums
Stapsgewijze uitwerking
Vind de volgende term: 1, 1, 2, 3, 5, 8, ?
- Controleer of elke term = som van de twee voorgaande: 1+1=2 ✓
- Ga door: 1+2=3 ✓, 2+3=5 ✓, 3+5=8 ✓
- Dit is Fibonacci-type. Tel de laatste twee termen op
- De volgende term is 13
Antwoord: 13