Verified Answer :

JunhaoZ

When you add 20 and 29, you get 49. When you add 21 and 28, you get 49. You will realize that there's 5 pairs that result in a sum of 49. 5*49=245.

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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