1.

Find the number of terms in the A.P. 18, 15 1/2 ,13,...,-37

Answer»

5n=105, n=21Step-by-step explanation:18, 15 1/2 ,13,...,-3718,15.5, 13,................-37Here a=18 d=15.5-18=-2.5We KNOW that An=a+(n-1)DSO -37=18+(n-1)(-2.5)MULTIPLYING by -274=-36+(n+1)5110=5n+55n=105, n=21



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