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[" 39."(1+2+3+...+49+50+49+48+...+],[3+2...

[" 39."(1+2+3+...+49+50+49+48+...+],[3+2+1)=?],[[" (1) "2525," (2) "2500],[" (3) "1250," (4) "5000]]

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1+2+3+...+49+50+49+...+3+2+1

1-(49)/(50)

Find (50^2 - 49^2) + (48^2 - 47^2) + (46^2 - 45^2) …… (2^2 - 1^2)

If f(n+1)=(2F(n)+1)/2,n=1,2,3,.... a n d F(1)=2. Then F(101) equals (a) 52 (b) 49 (c) 48 (d) 51

Find (50^2 - 49^2) + (48^2 - 47^2) + (46^2 - 45^2) +..+ (2^2 - 1^2)

If f(n+1)=(2F(n)+1)/2,n=1,2,3,.... a n d F(1)=2. Then F(101) equals 52 (b) 49 (c) 48 (d) 51

Find the sum of 1 + 2 + 3 + …………… + 50 + 49 + ……… + 3 + 2 + 1

The value of cos[2tan^(-1)(-7)] is :a) 49/50 b) -49/50 c) 24/25 d) -24/25