114. A friend recently planned a camping trip. He had two ashlights, one that required a single 6-V battery and another that used two size-D batteries. He had previously packed two 6-V and four size-D batteries in his camper. Suppose the probability that any particular battery works is p and that batteries work or fail independently of one another.

Our friend wants to take just one ashlight. For what values of p should he take the 6-V ashlight?