If Two vectors P & Q are at right angle
to each other if
(a)P+Q=0
(b) P-Q=0
(c) P×Q =0
(d)P*Q=0
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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic, meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic, meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.
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