Question

What is the next number in the sequence $225,100,36,9,1,?$

• A. $-7$
• B. $-6$
• C. $0$
• D. $-1$

Answer 1

The correct option is C $0$

${15}^2=225$

$\Rightarrow 15-5=10$

${10}^2=100$

$\Rightarrow 10-4=6$

$6^2=36$

$\Rightarrow 6-3=3$

$3^2=9$

$\Rightarrow 3-2=1$

$1^2=1$

$\Rightarrow 1-1=0$

so according to the pattern,

The solution is $0^2\Rightarrow 0$.