Answer to Q80
[9, 25, 49, x] [7, 10, 15, 8, 7]. What is x?
Let's rewrite the series as [A, B, C, D] [E, F, G, H, I]
(F - E)² = A : (10 - 7)² = 9
(G - F)² = B : (15 - 10)² = 25
(H - G)² = C : (8 - 15)² = 49
(I - H)² = D : (7 - 8)² = 1
Answer: 1
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Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
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