A website Maths Puzzle Logical Reasoning Missing Character

What is the next number in series 2,2,9,9,25,25.........?

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A website Other Question

4. If PQR = 1, RST = 0, and SPR = 0, which of the following must be zero
(a) P
(b) Q
(c) R
(d) S
(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*........*(1-1/99)