Awoman deposit $100 into her son saving account on his first birthday on his second birthday she deposits $125 and $150 on his third birthday and so on how much money what you deposit into her sons account on his 17th birthday

This is just showing what I did.
100=1     125=2     150=3     175=4     200=5     225=6     250=7     275=8     300=9     325=10   350=11    375=12  400=13   425=14    450=15   475=16   500=17. So on the son's 17th birthday his mom deposited $500 in her son's saving account. Hope I helped!

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.