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The side ST of triangle RST is produced ...

The side ST of `triangle RST` is produced to P. If `angle RTP=115^@` and `angle S=2/3 angle R`, then the measure of `angle R` is:
`triangle RST` का भुजा ST, P से उत्पन्न होता है। यदि `angle RTP=115^@` और `angle S=2/3 angle R` है, तो `angle R` का माप है

A

`68^@`

B

`69^@`

C

`67^@`

D

`66^@`

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