AIEEE Exam

If F1 = (3, 0) and F2 = (–3, 0) and P is any point
on the curve 16x^2
+ 25y^2
= 400 then PF1 + PF2
equals -
(A) 8 (B) 6 (C) 10 (D) 12

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AIEEE Other Question

The values of x between 0 and 2π which satisfy
the equation sinx 8cos x2 = 1 are in A.P. The
common difference of A.P. is - 2m white counters and 2n red counters are
arranged in a straight line with (m + n) counters
on each side of a central mark. The number of
ways of arranging the counters, so that the
arrangements are symmetrical with respect to the
central mark, is