IF A1 = ×12 8, A2 =102 98× , A3 =1002 998× , A4 =10002 9998× ,...
4.
If
a
1
= ×
12 8
,
a
2
=
102 98
×
,
a
3
=
1002 998
×
,
a
4
=
10002 9998
×
,
…
and
S
= + + + + ⋅⋅⋅ +
a
a
a
a
a
, then what is the sum of all the digits of S?
1
2
3
4
20
Answer :
4.
If
a
1
= ×
12 8
,
a
2
=
102 98
×
,
a
3
=
1002 998
×
,
a
4
=
10002 9998
×
,
…
and
S
= + + + + ⋅⋅⋅ +
a
a
a
a
a
, then what is the sum of all the digits of S?
1
2
3
4
20
Answer :