13G Filing: Capital World Investors and Ringcentral Inc (RNG)

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***By /s/ Donald H. Rolfe
Donald H. Rolfe
Attorney-in-fact

Signed pursuant to a Power of Attorney dated January 4, 2017
included as an Exhibit to Schedule 13G filed with the
Securities and Exchange Commission by Capital World Investors
on February 10, 2017 with respect to ITT Educational
Services, Inc.

CUSIP: 76680R206 Page 5 of 5

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