Question

The sum of 10 term of the progression 2+4+8+..........is​

Answer 1

Answer:

Clearly the given series is G.P with common ratio r=−2 and first term a=2

Also, n=10

S

n

be sum of first n terms of G.P

Formula for sum of n terms of G .P is given by

S

n

=

r−1

a(r

n

−1)

S

10

=

−2−1

2×([−2]

10

−1)

=

3

−2046

=−682

Answered By

Answer 2

Answer:

2+4+8+16+32+64+128+256+512+1024= 2046

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