Crucible/Ardent + Redemption

Playing soraka atm Saw curcible and redemption as recommended items. They both have +% heal and shield power but crucible has 20% where as redemption has 10% and they are both unique My question here is 1. Do they both stack to give me 30% shield and heal power? 2. If i have crucible and redemption and it turns out only one work, is it gonna be crucible?
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