Kelsey begins on a number line at the origin. She has a biased coin which shows heads, whenflipped, with probabilityp, 0< p <1. She flips the coin. If it shows heads, she moves oneunit to the right on the number line to 1. If it shows tails, she moves one unit to the lefton the number line to -1. She conducts this random experiment a total ofntimes, movingto the right or to the left from her current position one unit based on the outcome of theexperiment. Find the probability mass function of her location on the number line afternflips.