What is the tens' digit E of the sum of the first 40 terms of 1, 11, 111, 1111, 11111, 111111, ...? Select the correct option:	A) E=2	B) E=3	C) 4	D) 8	E) 9
All of the first 40 terms have 1 at the units place.   Except the first term, the tens digit of all the remaining 39 terms is 1.   So now if you do the addition   1 1   1 1   . . .   . . .   . . .   1 1   0 1   3 0   Answer is E=3
<result>B</result>
What is the tens' digit E of the sum of the first 40 terms of 1, 11, 111, 1111, 11111, 111111, ...?