if arithmetic mean of a - 1, a+5 , a+11 and a+17is 10 find the value of a
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a-1+a+5+a+11+a+17/4=10
4a+32=40
a+8=10
a=2
here value of a is 2.
4a+32=40
a+8=10
a=2
here value of a is 2.
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