# Data Structures :: Basic Concepts

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## 9. Ackerman's function is defined on the non-negative integers as follows

a(m,n) = n+1 if m=0

= a(m-1, 1) if m != 0, n=0

= a(m-1, a(m, n-1)) if m != 0, n0

The value of a (1, 3) is

**Answer:**

**Option B**

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