please explain the answer
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Step-by-step explanation:
nth term= 1/((n+4)*(n+5)) = 1/(n+4) - 1/(n+5)
n1= 1/5 - 1/6
n2= 1/6 -1/7
n3=1/7 -1/8
....
n20=1/24 -1/25. sum of 20 term = n1 + n2 +...+n20= 1/5 - 1/25 = 4/25 = 0.16
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