Practicing Success
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. p _ t b c p r _ b c _ r t b _ p _ t _ c |
r, c, p, b, t, r r, p, c, t, b, r r, t, p, c, r, b r, p, t, r, b, c |
r, t, p, c, r, b |
p r t b c / p r t b c / p r t b c / p r t b c r , t , p , c , r , b |