JalisaBalkin111 JalisaBalkin111

20-07-2015
Mathematics

Answered

What is the sum of the geometric series 20 + 21 + 22 + 23 + 23 + 24 + … + 29?

A1,023
B511
C2,407
D1,012

Verified Answer :

20-07-2015

Since the geometric series is not long we can pair up the number

20 + 29 = 49
21 + 28 = 49
22 + 27 = 49
23 + 26 = 49
24 + 25 = 49
Since we made 5 pairs of 49, the answer is 245. (49 x 5)

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porschia21 porschia21

18-03-2019

Answer:

1023

Step-by-step explanation:

2^0+2^1+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9

1+2+8+16+32+64+128+256+512=1023

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