The sum of the first 20 terms of the series `1/(5xx6)+1/(6xx7)+1/(7xx8)+\ ` is (a) 0.16 (b) 1.6 (c) 16 (d) None of these

The sum of the first 20 terms of the series (1)/(5xx6)+(1)/(6xx7)+(1)/(7xx8)+backslash is (a) 0.16(b)1.6c(c)16(d) None of these

What is the sum of the first 50 terms of the series (1xx3)+(3xx5)+(5xx7)+………….?

5, 16, 6, 16, 7, 16, 9 (a) 9 (b) 7 (c) 6 (d) None of these

1/(5 xx 6) + 1/(6 xx 7) + 1/(7 xx 8) + ….. + 1/(24 xx 25) ?

The sum of the first 20 terms common between the series 3+7+11+15+....1+6+11+16+.... and is

The sum of the first 20 terms common between the series 3+7 + 11 + 15…. and 1+6 + 11 + 16+ …. is

Sum of the series (1)/(4.5.6)+(1)/(5.6.7)+(1)/(6.7.8)+... upto oo is

The sum of the first 16 terms common between the series 3 +7+11+15+... and 1+6+11 +16+... is