Question

How many shaded circles will be there in pattern 81 ?

• A. 161
• B. 162
• C. 163
• D. 160

Answer 1

The correct option is C 163

Number of shaded circles in pattern 1=3
Number of shaded circles in pattern 2=5
Number of shaded circles in pattern 3=7
Pattern followed $(1\times 2)+1,(2\times 2)+1,(3\times 2)+1$,........
i.e,3,5,7,.......
Number of shaded balls in pattern $81\times 2+1=162+1=163$