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geometry

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Prove that 16^4-2^13-4^5 is divisible by 11.