Which are occur in double fertilization
Fusion of polar nuclei with the male gamete to form endosperm is triple fusion

The fusion involving two polar nuclei and a sperm nucleusthat occur in double fertilisation in a seed plant and results in the formation of the endosperm.
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When one male gamete fuses with polar nuclei and form pen and another male gamete fuses with egg cell forming zygote
The fusion involving two polar nuclei and a sperm nucleus

Male gamete+ endosperm