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OldTimer
Username
OldTimer
Score
32
Stats
Questions
7
Answers
0
7 Questions
0 Answers
+3
49
2
+32
Arithmetic Progression
Find the sum of the terms from the (n + 1) th to the m th term inclusive of an arithmetical progression whose
first term is a and whose second term is b.
If m = 13, n = 3 and the sum is 12a, find the ratio b: a.
read more ..
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OldTimer
Feb 8, 2018
0
73
2
+32
Binomial Theorem
If n Cr, denotes the coefficient of xr in the expansion of (1 + x) n, prove that:
n Cr + 2(n Cr+1) + n Cr+2 = n+2 Cr+2
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OldTimer
Jan 10, 2018
0
94
1
+32
Sum of Terms:Sum of n terms for -3n^2+2n+5
Required:
Sum of n terms for -3n^2+2n+5
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OldTimer
Dec 4, 2017
0
137
2
+32
Geometric Progression
The sum of the last 3 terms of a geometric progression having n terms is 1024 times the sum of the first 3 terms of the progression. If the third term is 5 find the last term.
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OldTimer
Nov 10, 2017
+1
132
1
+32
Factorisation
Express a4(b - c) + b4 (c - a) + c4 (a - b) as the product of four factors.
(b-c),(c-a) and (a-b) are products of this expression
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OldTimer
Oct 20, 2017
0
444
2
+32
If x = log a (bc), y = log b (ca) and z = log c (ab) prove that
If x = loga(bc), y = logb(ca) and z = logc(ab) prove that
x + y + z = xyz - 2.
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OldTimer
Sep 29, 2017
0
295
1
+32
Find xy and hence solve for all values of x and y
Hi Can you show steps in solving this problem:
solve(1/x+1/y=3/4, x^2/y+y^2/x=9)
read more ..
Alan
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OldTimer
Jul 23, 2017