Double shows the minimum strength of the 1nt opener or more. So in case of a 15 17 nt, it shows 15+ (so the description 13+ is wrong).
East should pass instead of bidding 2c.
From https://www.bridgebum.com/cappelletti.php:
Responses to the Double
Advancer (overcaller's partner) is typically expected to pass. However, she may run with a 5+ card suit and a very weak hand.
EdwardPiwowar
commented
1 month ago
Double shows the minimum strength of the 1nt opener or more. So in case of a 15 17 nt, it shows 15+ (so the description 13+ is wrong). East should pass instead of bidding 2c. From https://www.bridgebum.com/cappelletti.php: Responses to the Double Advancer (overcaller's partner) is typically expected to pass. However, she may run with a 5+ card suit and a very weak hand.
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