Respuesta :

bobeld
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)

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