Question

$157273343507$

Answer 1

Here the rule which is applicable on the series: 157 273 343 507 is Rule B: Square the number and add it to the number following the squared number as:
${12}^2+13=157,{16}^2+17=273,{18}^2+19=343and{22}^2+23=507$
Hence, rule (B) is the correct answer.