Different Ways Of Online Marketing - Marketing World

Learn to start an online business with market research, a business plan, a website, and marketing strategies to effectively grow your company. Hi, I have an issue I cannot resolve, neither can I identify the relevant rules/information. I have doubts of whether "different" should be always followed by a plural, or if the singular is allowed and when.

Specifically, the context is this example: a) We applied pulses of different...