IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 642  648 of 968
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Question number: 642
Question
Between the numbers 7 and 70,28 means are inserted, then their sum is ________
Choices
Choice (4)  Response  

a.  1795 

b.  1078 

c.  1695 

d.  1895 

Question number: 643
Question
In an A. P, If it is given that then is equal to ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 644
Question
The value of is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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.  4 

b.  1 

c.  3 

d.  2 

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.  6 

b.  4 

c.  9 

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.  8 

d.  10 
