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31 .
Find out the wrong number in the given sequence of numbers.
1, 2, 6, 15, 31, 56, 91

32 .
Insert the missing number.
7, 26, 63, 124, 215, 342, (....)

33 .
The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in 2001, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year commodity X will cost 40 paise more than the commodity Y ?

34 .
There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is:

35 .
If a - b = 3 and a2 + b2 = 29, find the value of ab.