if { x } is the product of all even integers from 1 to x inclusive , what is the greatest prime factor of { 26 } + { 24 } ?
"soln : { 26 } + { 24 } = 26 * { 24 } + { 24 } = 27 * { 24 } answer : c"
add(divide(add(26, 24), const_2), multiply(1, const_2))