Statement 1: Let the two digits of the number be ab. Sum of digit = a + b = 17 Statement 1 alone is not sufficient to answer this question. Statement 2: Let the two digits of the number be ab. Diffirence of the digit = a – b = b - a = 1 Statements 2 alone is not sufficient to answer this question. When we use both the statements then the result will be: ⇒ a = 8 , b = 9 or a = 9, b = 8 ∴ Statement 1 and Statement 2 is not sufficient to answer this question