Find out the wrong term from the given series:
$3, 7, 15, 39, 63, 127, 255, 511$

Two terms have been put within brackets. Mark your answer as:
$4, 7, (9), 10, 13, 15, (16), 19$

Study carefully the following arrangement of letters, digits and symbols to answer these

questions.

$M, 7 ,\&, 8, L ,P ,@ ,Q ,N ,\beta ,T ,Y ,3 ,2 ,= ,E ,\$ ,4 ,9 ,\#, G ,H ,5$

$'78'$ is to $'P?6'$ and $'?N'$ is to $'T32'$ in the same way as $2 E'$ is to $\ldots \ldots \ldots . . .$ in the arrangement.

How many such digits are there in the number $52361984$ each of which is as far away from the beginning of the number as when the digits are rearranged in ascending order within the number?

Choose the correct alternative for the missing term in the series:
$QPO, SRQ, UTS, WVU, ?$

Complete the series: $4, -8, 16, -32, 64, (\ldots)$