SajjadAhmad wrote:

Anjeanette inserts light bulbs in a row of light sockets in the repeating pattern red bulb, white bulb, white bulb, red bulb, white bulb, and white bulb. If she inserts a total of n red bulbs in the row, including the first and last bulbs, how many white bulbs did she insert in the row?

A. 2n − 2

B. 2n − 1

C. 2n + 1

D. 3n − 2

E. 3n + 1

The pattern is as follows

RWWR----------------2R 2W

RWWRWWR----------3R 4W

RWWRWWRWWR----4R 6W

this pattern is given by 2n-2 for a total of n red bulbs in the row, including the first and last bulbs

Hence option A is correct

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