99. What is the value of 22 +42 +62 +
........ + 202 ?
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Step-by-step explanation:
ap,22,42.....
a=22
d=20
an=202
sn=?
an=a+(n-1)d
202=22+20n-20
200=20n
n=10
s10=10/2(44+9*20)
=5*224
=1120
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