Select  the  incorrect  statement

(1, 2, 4) are correctStatement  (3)  is incorrectCorrect  (3) : One  femto gram = 10-15 g.Explanation of (1,2, 4)(l) Zero to the left of  the first non-zero digit in a number aresignificant(2) In scientific  notation,  the significant  figures of only for thefirst factors are counted(4) It is correct