Question
What is the next number in this series: 2, 6, 15, 40, 145, _?
A. 236
B. 345
C. 756
D. 456
Answer: C. 756
Solution:
1! + 1^2 = 2,
2! + 2^2 = 6,
3! + 3^2 = 15,
4! + 4^2 = 40,
5! + 5^2 = 145,
So, 6! + 6^2 = 756.
Hence, the answer is 756.
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The sum of the two numbers is 25. If one of the numbers is 10, what is the other number?
Find the missing number (x) in the sequence 0,0,3,7,x,26
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