Lillian built a staircase out of blocks. She used 3 blocks to make the first step, 6 blocks to make the second step and 9 blocks to make the third step. If she continues using the same pattern, how many total blocks will she have used after making the fourth step?

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted

you could deduce the conclusion directly using the facts pertaining to the specific situation.

hope this .

the answer is -1 for this question

step-by-step explanation: