self Maths Puzzle

Amit has a RS 1,5 10 and 20 note in his wallet.how much ways are there for him to pull out 2 notes and have enough to pay Rs 8 for lunch?

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self Other Question

who has not as a child played this game which is now a subject of recreational mathematics?A-Tic-tac-toe ,B-chess ,C-Ludo ,D-Domino What is the next number of the following sequence
11, 13, 17, 19, 23, 29, 31, 37, 41,..... ?