CDF of Beta distribution

i want to use CDF for beta distribution.
s=1 and t=3

b=0.15 (that mean's i need probability less than 0.15)

which function i should use?

or any other please suggest
Thank you

print(z1_beta <- pbeta(0.15, 1,3))

Thank you for your reply. :smiling_face_with_three_hearts:

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