Question

(91+92+93+............+110). (a)4020 (b)2010 (c)6030 (d)8040​

Answer 1

Answer:

answer will be option a)2010

Step-by-step explanation:

{(91+110)×20}/2

=(201×20)/2

=4020/2

=2010

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Answer 2

Step-by-step explanation:

(91 + 92 + 93 + ……… +110)

First term a = 91

Last term l = 110

Common difference, d = 1d=1

Let number of terms = n

Last term in an A.P. = a + (n - 1)d = 110

91 + (n - 1)(1) = 110

n - 1 = 110 - 91

n = 19 + 1 = 20

Sum of A.P. = (n/2) (a + l) = (20/2)(91 + 110) = 10 × 201 = 2010