Question

2,6,18 sum of the series upto 7 term is options are A)210 B)215 C)310 D)315 answer is in these options please solve the question​

Answer 1

Answer:

Sum upto 7 terms is 2186 : If your series is 2,6,18,...

Step-by-step explanation:

2,6,18,54,.. are in Gp

first term a=2, common ratio=3(i.e, 2*3=6,6*3=18,...)

Sum = $\frac{a( r^{n}-1 )}{r-1}$ (here n=7)

$=\frac{2(3^{7} -1)}{3-1} =\frac{2(2187-1)}{2} =2186$