Question 775624
This is a problem of Arithmetic Progression. The first term is 1 and the common difference is 2 and sum of first N terms is 100. We are supposed to find the value of N.

Using the summation formula:
{{{(2a+(N-1)d)*N/2 = S[N]}}}
{{{(2*1+(N-1)*2)*N/2 = 100}}}
{{{(2+2N-2)*N/2 = 100}}}
{{{N^2 = 100}}}
{{{N=10}}}


Therefore, 10 rows of blocks can be created.