If (10)9 + 2(11)1 (10)8 + 3(11)2 (10)7 +...... +10 (11)9 = k (10)9, then k is equal to :
100
110
Use
Sum of n terms of a GP -
- wherein
first term
common ratio
number of terms
and
(10)9 + 2(11)1 (10)8 + 3(11)2 (10)7 +...... +10 (11)9 = k(10)9
Take common 109
Subtract
Option 1)
100
Option 2)
110
Option 3)
Option 4)
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