IMO Mathematics Olympiad Class 10: Questions 645  650 of 958
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Question number: 645
Question
If up to n terms and n is even, then S equals________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 646
Question
Let denotes the sum of n terms of an A. P. , whose first term is a. if the common difference d is given by then K is equal to ________ ________
Choices
Choice (4)  Response  

a.  2 

b.  1 

c.  4 

d.  3 

Question number: 647
Question
Product of the fourth term and the fifth term of an arithmetic progression is 594. Division of the ninth term by the fourth term of the progression gives quotient as 2 and the remainder as 3. Find the first term of the progression
Choices
Choice (4)  Response  

a.  9 

b.  6 

c.  4 

d.  7 

Question number: 648
Question
The sum of all terms of the arithmetic progression having ten terms except for the first term, is 81, and except for the sixth term, 55. Find the third term of the progression if the sum of the first and the fifth term is equal to 12.
Choices
Choice (4)  Response  

a.  5 

b.  15 

c.  10 

d.  8 

Question number: 649
Question
If a, b, c are in A. P, then is equal to ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 650
» Logical & Analytical Reasoning
Question
If in a certain language CHARCOAL is coded as 32143516 and MORALE is coded as 754168, then the REAL code is ________
Choices
Choice (4)  Response  

a.  4862 

b.  1648 

c.  4816 

d.  6216 
