Find the next number in the sequence

1, 2, 6, 21, 88, __?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

What is the Surname of Barbie Doll?

Complete the table series riddle by finding the number that can replace "??".

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

What can go through glass without breaking it?