chetan2u wrote:
gracie wrote:
Integer x equals the number of terms of an arithmetic progression and it's common difference. If the range of the progression is 6x, what is the value of x?
A. 3
B. 5
C. 7
D. 9
E. 11
Let the common difference be d, and the first element be a.so \(d=x\), and last term = \(a+(x-1)d\)..
Now
RANGE = last term-first term = \((a+(x-1)d)-1=(x-1)d=6x\)
Substitute d=x, so \((x-1)x=6x.....x-1=6\) or \(x=7\)
We cancelled out x from both sides as x cannot be 0.C
Hello Chetan Sir,
Just a query..
X equals Y and Z means mean X=Y ,X=Z
I initially assumed this wrong int this question .
x= NUMBER OF terms of AP + Common diffrerence..
I guess this was wrong .
close
61% (01:32) correct 
