I am a learner of astrology and i have few doubts

1) Let us assume that a rajyoga is due to combination of 2-3 planets(ex
kalpadruma,vasumati....). will dasha of any planet forming the yoga, will
activate the rajyoga. ?

2) some astrologers say that, "100 good yogas in a natives horocope born with
Kumbha lagna, is waste, why"

3) what are bhava sandhis?

hope i get answer

Sumanth
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