Question
Question: The sum of the series <sup>10</sup>C<sub>1</sub>. 4 + <sup>10</sup>C<sub>2</sub> 4<sup>2</sup> + …… ...
The sum of the series 10C1. 4 + 10C2 42 + …… + 10C10 410 is
A
210
B
510
C
210–1
D
510 –1
Answer
510 –1
Explanation
Solution
(1 + 4)10 – 10C0 = 510 – 1