find the 12 th term of an arithmetic progression whose first term is 2 and the common difference is 8 .
"n th term of a . p = a + ( n - 1 ) * d = 2 + ( 12 - 1 ) * 8 , = 2 + 88 = 90 . answer : d"
add(multiply(subtract(12, const_1), 8), 2)