If an AP,if d=-4,n=7,an=4, then a is. (A)6 (B)7(C)20(D)28

1.	If an AP,if d=-4,n=7,an=4, then a is. (A)6 (B)7(C)20(D)28
Answer» D)28Steps:=> An=a+(n-1) d=> 4=a+6*-4=> 4=a-24=> a = 4+24=> a = 28 an=a+(n-1)d4=a+(7-1)-44=a-244+24=aa=28

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