Question

What's the recursive description of the set 4, 5, 7, 10, 14, 19 etc.

Answer 1

The answer would be the recursive design of set 4,5 and 6

Answer 2

Hi,

Explanation:

`a_1=4\\a_2=a_1+1=4+1=5\\a_3=a_2+2=5+2=7\\a_4=a_3+3=7+3=10\\a_5=a_4+4=10+4=14\\...\\\\\boxed{a_(n+1)=a_n+n}`

Recursive description is :

`\left\{\begin{array}{ccc}a_1&=&4\\a_(n+1)&=&a_n+n\\\end {array} \right.\\`