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- Thread starter Ruqia.Azami
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a+(9-1)d = 22 -----(Using the a+(n-1)d = an formula where n=9)

a+8d = 22 ---------(Equation 1)

(n/2)*(2a+(n-1)d = S

(4/2)*(2a+(4-1)d) = 49

4a+6d = 49 ---------(Equation 2)

Solving them simultaneously gives a =10, d = 3/2

(ii)

a+(n-1)d = an

10+(n-1)*3/2 = 46

(n-1)*3/2 = 36

n-1 = 24

n = 25