问一道GMAT的DS题if n is a positive integer,what is the tens digit of 1.the hundreds digit of 10n is 62.the ens digit of n+1 is 7
问题描述:
问一道GMAT的DS题
if n is a positive integer,what is the tens digit of
1.the hundreds digit of 10n is 6
2.the ens digit of n+1 is 7
答
1 可以推出十位是6
2 推出十位是6或者7
答
the hundreds digit of 10n is 6------说明n的十位是6
the ens(这里应该是tens吧?) digit of n+1 is 7--------说明n是69
这题只问 tens digit,那就是6,2这个条件没用