11th Class Math MCQS
For what value of n, is an+bn/ an-1 +bn-1 the G.M. between a and b?
-1/2
1/2
None of these
0
?nk=1[km-(k-1)m] =__________
mn
mm
nm
nn
The sum of first n – terms an A.p is:
Sn = a1 +an
Sn = n(a1 -an)
Sn = n/2(a1 +an)
Sn = n+1/2 (a1+an)
The A.M. between x+3 and x-3 is
x
x-6
x+6
2x
If an = (a+1) an-1 , a1 = 1 then a2 is:
-3
2
3
-2
The 5th term of the G.P 3,6,12……….. is:
48
2
15
3
If 1/a, 1/b and 1/c and in A.P them b =
a-ac/2a
ac/a+c
2ac/a+c
a-c/ac
If Sn = a(1-rn)/ 1-r and if Sn——-> a as n ——> ? then the series is
None of these
Convergent
Divergent
Does not exist
3+6+9+…………3n =
2n(n+1)/3
3n(n+1)/2
3n(n-1)/2
2n(n-1)/3
The geometric means between 2 and 4 are:
±3?2
±8?2
±2?2
±4?2
Continue Reading Go to Next Page
Google Ads