Find out the wrong term from the given series.
$5, 10, 40, 80, 320, 550, 2560$

Choose the correct alternative for the missing term.
$DEF, HIJ, MNO, ?$

Study the following arrangement carefully and answer the question given below:
$B, 2, I, J, K, 4, 3, H, 5, E, R, P, 6, N, A, 9, W, 8, T, U, 1, V, D, 7, F$
How many such numbers are there in the above arrangement,each of which is immediately preceded by a vowel and immediately followed by a consonant?

Find the missing letters for the given series from the given alternatives.
$ccbab....caa.....bccc.....a.....$

Fill in the blank space for the given series with the correct alternative.
$2, 6, 3, 4, 20, 5, 6, (\ldots), 7$

The positions of how many digits in the number $7,3,5,4,6,1,2$ will remain unchanged after the digits within the number are rearranged in descending order from left to right?