Question

2)Tính 

a) A=1+2+2²+2³+2⁴+2⁵

b) B= 1+3+3²+3³+3⁴+3⁵

c) C=  1+2+2² +2³+2⁴+.....+2¹⁰⁰-2¹⁰¹

d)D= 1+3+3²+3³ +3⁴ +3⁵ +.....+ 3⁹⁹

Answer 1

b, 2B=3²+3³+3⁴+3⁵+3⁶

2B-B=3+3⁶