Choose the correct alternative to complete the series: $aab....aa....bbb....aaa....bbba$

Choose the correct alternative answer

$m....nm....n.....an.....a....ma.....$

Fill in the blank space for the given series with the correct alternative.
$71, 76, 69, 74, 67, 72, (\ldots)$

Fill in the blank space for the given series with the correct alternative.
$123456147, 12345614, 2345614, 234561, (...)$

Find the missing terms for the given series from the given alternatives:
$R, M, (?), F, D, (?)$

Study the following arrangement carefully and answer the question given below:
$7, R, E, T, 4, A, 9, \%, D, F, 1, U, \#, B, @, 8, H, I, W, M, \star, 3, 2, V, \,5,N,P,6,Q$
How many such numbers are there in the above arrangement,each of which is immediately preceded by a letter but not immediately followed by a symbol?