29. ਚ' ਚ ਛ ਜ ਚ ' ' 2 बराबर है- (1) ...
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29. ਚ' ਚ ਛ ਜ ਚ ' ' 2 बराबर है- (1) (2)

11th - 12th Class
Maths
Solution
45
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29. ( (3) frac{1}{5 times 4}+frac{1}{5 times 6}+frac{1}{6 times 7}+frac{1}{7 times 8} ) ( begin{aligned} &+frac{1}{8 times 9}+frac{1}{9 times 10}+frac{1}{10 times 11}+frac{1}{11 times 12} =frac{1}{4}-frac{1}{5}+frac{1}{5}-frac{1}{6}---+frac{1}{10}-frac{1}{11}+frac{1}{11} frac{1}{12} &=frac{1}{4}-frac{1}{12}=frac{3-1}{12}=frac{2}{12}=frac{1}{6} end{aligned} )
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