Math Is Fun Forum / 5 Star Questions

ganesh · 2009-01-30 02:43:45

#103. NO!

#104. What is the number of factors (including 1 and the number itself) of

?

#105. What is the sum of all the proper divisors of 9900 (other than 1 and the number itself)?

#106. What is the sum of all the divisors of
?

JaneFairfax · 2009-01-30 07:32:01

ganesh · 2009-01-30 15:22:15

Answers to #102, and #103:-
Both the answers are correct, JaneFairfax!

ganesh · 2009-01-31 02:45:24

#107. What is the value of

?

#108. If x = a cos²M sin N and y = a sin²M cos N, what is the value of
?

#109. If sin x + sin² x = 1, then what is the value of
?

JaneFairfax · 2009-01-31 10:26:42

ganesh · 2009-01-31 17:14:55

Answer to #109:-
Perfect, JaneFairfax!

#110. Let n (>1) be a positive integer. What is the largest integer m such that

is divisible by ?

#111. If S be the sum, P the product, and R, the sum of reciprocals of n terms of a Geometric Progression, what is
equal to?

#112. If
, where |a|<1;
where |b|<1, then what is
equal to?

ganesh · 2009-02-01 02:19:34

#113. What is the value of

?

#114. If , then what is the value of
?

#115. What is the largest number of four digits exactly divisible by 88?

JaneFairfax · 2009-02-01 04:20:21

ganesh · 2009-02-01 17:23:15

Answers to #113, #114, and #115 :-

All correct, JaneFairfax!

ganesh · 2009-02-01 17:41:23

#116. If xy + yz + xz = 0, then, what is the value of

?

#117. If the sum of the first 11 terms of an Arithmetic Progression is equal to that of the first 19 terms, then what is the sum of the first 30 terms of the Arithmetic Progression?

#118. Two boats travelling at speeds of 5 km/hour and 10 km/hour, head directly towards each other. They begin at a distance of 20 kilometers from each other. How far apart would they be (in kilometers) one minute before they meet each other?

#119. Two new societies, P and Q, are formed on the 1st of January, 2009, each with n members. On the first day of each subsequent month, society P adds b members while society Q multiplies its number of members at that point of time by a constant factor r. Both the scieties P, and Q would have the same number of members on July 2, 2009. If b = 10.5(n), what is the value of r?

#120. What is/are the value(s) of r if
?

JaneFairfax · 2009-02-01 23:38:34

ganesh · 2009-02-01 23:38:55

Answers to #116, #117, #118, #119 and #120:-
All correct, JaneFairfax!

http://www.geocities.com/aishwarya_82/image/grtjb2002.jpg

ganesh · 2009-02-01 23:51:34

#121. If

are the roots of the equation , what is the value of
?

#122. If p and q are the roots of the equation , then what is/are the value(s) of p?

ganesh · 2009-02-02 00:07:16

#123. If x, y, z are the

terms respectively of an Arithmetic Progression and also of a Geometric Progression, then what is the value of
?

JaneFairfax · 2009-02-02 00:30:23

ganesh · 2009-02-02 00:52:06

Answers to #121, and #122:

Both correct, JaneFairfax!!!

#124. For the equation

where p>0, if one of the roots is the square of the other, what is p equal to?

#125. How many quadratic equations are there which are unchanged by squaring their roots?

#126. How many real roots does the following quadratic equation have:
?

ganesh · 2009-02-02 01:59:10

Answers to #124, and #126:-

JaneFairfax · 2009-02-02 02:05:10

ganesh · 2009-02-02 02:27:14

Answers to #124, and #126:-
Both correct, JaneFairfax!
Excellent!!!

#127. Which is the term independent of x in the expansion of

?

#128. If the fourth term of the following expansion is , then what are the values of a and n?

JaneFairfax · 2009-02-02 03:47:11

ganesh · 2009-02-02 15:46:37

Answers to #127, and #128:-
#128 is correct.
Excellent!!!

#127: But for a minor calculation mistake, you would've got the right answer. Please check your answer.

#129. What is the sum of the coefficients of the odd powers of x in the expansion of

?

JaneFairfax · 2009-02-02 22:28:01

I had an inkling I had made a careless mistake somewhere.

ganesh · 2009-02-03 02:46:59

#130. If the coefficients of

and are 3 and -6 respectively in the expansion of
,
then what is the value of m?
(i) 6 (ii) 9 (iii) 12 (iv) 24

#131. In the exapnsion of , the sum of the fifth and sixth terms is zero. Then, what is equal to?

#132. If the coefficients of the and terms in the expansion of are equal, then what is r equal to?

ganesh · 2009-02-05 02:10:29

#133. What is the value of

?

#134. What is tanA + tanB if in the triangle ABC, C is equal to 90°?

#135. If ,
then what is the value of
?

ganesh · 2009-02-05 02:13:40

#136. If

, then what is equal to?

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