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CBSE Class 10 Answered

Eg4 please...Why are 'means' taken as a-d,a+d and not the other two?

Asked by drhimasingh | 25 Dec, 2019, 08:30: PM
Expert Answer
Extremes are the numbers at the end which are (a-3d) and (a+3d)
(a-d) and (a+d) are the means because in an AP a,b,c,d
b is the mean of a and c
c is the mean of b and d
Hence, (a-d) and (a+d) are taken as means. 
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