what would be the no of digits in 4^{61}+4^{62}+4^{63}+4^{64}+4^{65}
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All of those numbers is less than or equal to so their sum is less than . so has 39 digits and 5 times that has 40 digits.
Hello, vjdm! We have: . Take logs: . m . . . . . . . . . . . . . . . . . . Therefore, has 40 digits.
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