3. (a) समान्तर श्रेढी 2, 6, 10, ....... , 86 का अन्त से पन्द्रह
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A=2 d=4
L= 86
86= 2+(n-1)d
86-2= (n-1)4
84/4=n-1
n=22
15th from end = 22-15+1 =8
A(8)=2+{8-1}4
= 2+28 =30
L= 86
86= 2+(n-1)d
86-2= (n-1)4
84/4=n-1
n=22
15th from end = 22-15+1 =8
A(8)=2+{8-1}4
= 2+28 =30
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