In a certain state car license plates are numbered in the form of ll , where l stands for a letter of the alphabet and n stands for a 1-digit number from 0 to 9. how many car license plates outcomes are possible are there if all are allowed

Given:
LL

L - alphabet
N - number from 0 to 9

There repetition is allowed so. there are 26 choices in both Ls and 10 choices in the 4 Ns.

L       L      N      N     N     N
26 * 26 * 10 * 10 * 10 * 10 = 6,760,000

There are 6,760,000 car license plate outcomes that are possible if all are allowed. 

2. 28.26 ft3.  4.71 yd4.    152.04 m5.  56.59 yd