Question
PSLE
Letters S, R, F formed a patten as shown below.

S R F R S S R F R S S R F R S . . .

If there are 139 'S', what is the greatest possible number of letters in the pattern?
2 m

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PSLE
Letters S, R, F formed a patten as shown below.

S R F R S S R F R S S R F R S . . .

If there are 139 'S', what is the greatest possible number of letters in the pattern?