Ex 10.1
show that 1.2+2.3+..............+n(n+1)=n(n+1)(n+2)/3
find the 10th term in the expansion of (x-y^2)^14
Y=3x-x2 and x is increse at the rate of 3 unit / seconnd then find the slop when x=2
Ls no 6 lines and angels 9th std ex 6.3
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