linear combination of vs linear combinations of

Some examples from the web:

• The statistical analysis reduces the information to two components, each of which is a linear combination of the same six online variables.
• The term "Acrylates" is used to describe linear, non-cross linked copolymers that contain combinations of acrylic acid, methacrylic acid and their methyl, ethyl, propyl or butyl esters.
• "Focal plane array" (6) means a linear or two-dimensional planar layer, or combination of planar layers, of individual detector elements, with or without readout electronics, which work in the focal plane.
• "Focal plane array" (6) means a linear or two-dimensional planar layer, or combination of planar layers, of individual detector elements, with or without readout electronics, which work in the focal plane.
• A combination of measures should be considered.
• The combination of acids and sugar sounds like ingredients.
• It was a combination of medication and intensive sessions.
• That was one potent combination of verbal diarrhea and stunned silence.
• It is a combination of competitiveness and cohesion.
• The third option is a combination of those two forms.
• This combination of interests had practical consequences.
• The combination of these last two instruments can prove redoubtable.
• Tortoiseshell is a combination of colors.
• Combination of henna and iron oxide or something.
• A combination of poor penmanship and homemade inks.
• We have a combination of factors.
• Competent authorities may apply a combination of methods 1, 2 and 3, or a combination of two of these methods.
• Part 5 - Combinations of credit risk mitigation in the Standardised Approach
• However, a combination of several results per version indicating the worst case is permissible.
• To actively support innovation, a combination of instruments is usually needed.

Some examples from the web:

• The statistical analysis reduces the information to two components, each of which is a linear combination of the same six online variables.
• The term "Acrylates" is used to describe linear, non-cross linked copolymers that contain combinations of acrylic acid, methacrylic acid and their methyl, ethyl, propyl or butyl esters.
• "Focal plane array" (6) means a linear or two-dimensional planar layer, or combination of planar layers, of individual detector elements, with or without readout electronics, which work in the focal plane.
• "Focal plane array" (6) means a linear or two-dimensional planar layer, or combination of planar layers, of individual detector elements, with or without readout electronics, which work in the focal plane.
• A combination of measures should be considered.
• The combination of acids and sugar sounds like ingredients.
• It was a combination of medication and intensive sessions.
• That was one potent combination of verbal diarrhea and stunned silence.
• It is a combination of competitiveness and cohesion.
• The third option is a combination of those two forms.
• This combination of interests had practical consequences.
• The combination of these last two instruments can prove redoubtable.
• Tortoiseshell is a combination of colors.
• Combination of henna and iron oxide or something.
• A combination of poor penmanship and homemade inks.
• We have a combination of factors.
• Competent authorities may apply a combination of methods 1, 2 and 3, or a combination of two of these methods.
• Part 5 - Combinations of credit risk mitigation in the Standardised Approach
• However, a combination of several results per version indicating the worst case is permissible.
• To actively support innovation, a combination of instruments is usually needed.