HOW MANY COMBONATIONS CAN I GET AND OR HOW MUCH MONEY IM GOING TO HAVE TO SPEND?

OK IM PLAYING THE OHIO CLIC LOTTO. ITS $1 FOR A SET OF 6 NUMBERS. YOU HAVE TO PIC 6 OUT OF 49 NUMBERS. OK HERE IS WHAT I WANT TO KNOW. I DONT WANT TO PIC FROM THE WHOLE 49 NUMBERS. I WANT TO NAROW IT DOWN TO 25 NUMBERS. I WANT TO USE 25 NUMBERS MAKING SETS OF 6 NUMBERS. HOW MANY POSSIBLE COMBONATIONS WILL I GET? IF YOU CAN SHOW ME THE MATH INVOLVED THAT WOULD BE GREAT! THANKS!