Question

3. For an given A.Pt; = 4, d = -4, then a =? (a) 6 (b) 7 (c) 20 (d) 28​

Answer 1

Let T

r

be the r

th

term of an A.P. for r=1,2,3,... If for some positive integers m, n we have T

m

=

n

1

  and  T

n

=

m

1

,  then T

mn

equals

Medium

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If sec(θ+α), secθ, sec(θ−α) are in A.P. then cosθ sec α/2=

Medium

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