Numbered 31051

Pavel walks down the street on the side where the houses are numbered with even numbers. From the number 2, count the number of twos in the house numbers. He stops at home, in front of which he counts the fifteen two. What is the number of this house?

Correct answer:

x =  92

Step-by-step explanation:

n1=2 n2=12 n3=20 n5=22 n6=24 n7=26 n8=28 n9=32 n10=42 n11=52 n12=62 n13=72 n14=82 n15=92  x=n15=92



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