Math, asked by jainanushka1799, 1 year ago

Find the sum of 34+32+30.....+10 by using ap formula

Answers

Answered by ak1051281
0
286 will be your answer.
Answered by hdika
1

Answer: 286

Step-by-step explanation:

here we have ; a = 34 ,

                      d = a2 - a1

                         = 32 - 34

                       d = - 2

                      nth term = 10

            by formula of nth term i.e, nth term = a + (n - 1) d

 substituting all values we get ,          10 = 34 + (n - 1) - 2

                                                              10 = 34 + -2n + 2

                                                           10 - 34 -2 = - 2n

                                                            10 - 36 = -2n

                                                                  - 26 = -2n

                                                                n = -26 / -2

                                                                n = 13

now by formula to find sum of an A.P i.e, sum of n terms = n/2 [a + nth term]

substituting all values we get ,               sum of n terms   = 13/2[34 + 10]

                                                                  sum of n terms = 13/2(44)

                                                                 sum of n terms = 13 *22

                by solving we will get           sum of n terms =  286 which is our required answer

I HOPE THIS WILL HELP YOU

THANK YOU

Similar questions