Question

In an A.p a= 3 d= -2 write a) A.p b)an c) S10

Answer 1

Answer:

A.P=3,1,-1,-3,-5.............

an=a(n-1)d

   =3(10-1)*-2

   =-54.

S10=n/2{a+an}

     =10/2{3+-54}

     =5{-51}

     =-255.

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

A.P=3,1,-1,-3,-5.............

an=a(n-1)d

   =3(10-1)*-2

   =-54.

S10=n/2{a+an}

     =10/2{3+-54}

     =5{-51}

     =-255.