Self Maths Puzzle Numerical Ability

while team selection for T 20 WORLD CUP,it was decided that Dhoni bats before Yuvraj, Kohli will play at no 3, while Ashwin and Raina will bat at consecutive no.
Then in how many ways, batting order of 11 member team can be decided

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Self Other Question

What is the next number of the following sequence
16,22,26,38,62,74,......
If sum of first 2 terms of a GP is thrice first term. & 4th term of GP is 256. Find 9th term of GP