how many times digit 10 is used while writing numbers from 100 to 1000 ?
"in 100 to 300 there are 20 ten ' s in 300 to 500 there are 20 ten ' s in 500 to 700 there are 20 ten ' s in 700 t 0 900 there are 20 ten ' s in 900 to 1000 there are 10 ten ' s so total is 90 ten ' s correct option : b"
add(add(divide(subtract(1000, 100), const_10), multiply(add(const_10, const_1), add(const_10, const_1))), multiply(10, const_2))