Which was the first computer to use transistors instead of vacuum tubes?

Which was the first computer to use transistors instead of vacuum tubes? Correct Answer IBM-1401

The IBM 1401 is a variable wordlength decimal computer that was announced by IBM on October 5, 1959. The first member of the highly successful IBM 1400 series, it was aimed at replacing unit record equipment for processing data stored on punched cards and at providing peripheral services for larger computers.
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