let vecp-2hati-hatj+hatk , vecq=hati+2ha...

let `vecp-2hati-hatj+hatk , vecq=hati+2hatj-hatk` and `vecr=hati+hatj-2hatk` if `vecV=vecp+lambdavecq` and projection of `vecV` on `vecr` is `4/sqrt5` then `lambda` is

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